|**Stockholders' Equity (Tables)**                                                            | 12 Months Ended                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                
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|**Stockholders' Equity Note [Abstract]**                                                     |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                
|Schedule of Common Stock Outstanding Roll Forward                                            | Changes in common stock for the years endedOctober 31, 2015,2014and2013are as follows.In thousandsSharesAmountBalance, October 31, 201272,250$442,461Issued to participants in the Employee Stock Purchase Plan (ESPP)331,056Issued to the Dividend Reinvestment and Stock Purchase Plan (DRIP)72022,791Issued to participants in the Incentive Compensation Plan (ICP)963,065Issuance of common stock through public share offering, net of underwriting fees3,00092,640Costs from issuance of common stock—(369)Balance, October 31, 201376,099561,644Issued to ESPP341,143Issued to DRIP69823,443Issued to ICP1003,315Issuance of common stock through forward sale agreements, net of expenses1,60047,290Balance, October 31, 201478,531636,835Issued to ESPP311,239Issued to DRIP66924,679Issued to ICP1304,964Issuance of common stock through forward sale agreements, net of expenses1,52253,702Balance, October 31, 201580,883$721,419
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|In thousands                                                                                 |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                
|Balance, October 31, 2012                                                                    |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                
|Issued to participants in the Employee Stock Purchase Plan (ESPP)                            |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                
|Issued to the Dividend Reinvestment and Stock Purchase Plan (DRIP)                           |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                
|Issued to participants in the Incentive Compensation Plan (ICP)                              |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                
|Issuance of common stock through public share offering, net of underwriting fees             |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                
|Costs from issuance of common stock                                                          |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                
|Balance, October 31, 2013                                                                    |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                
|Issued to ESPP                                                                               |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                
|Issued to DRIP                                                                               |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                
|Issued to ICP                                                                                |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                
|Issuance of common stock through forward sale agreements, net of expenses                    |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                
|Balance, October 31, 2014                                                                    |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                
|Issued to ESPP                                                                               |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                
|Issued to DRIP                                                                               |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                
|Issued to ICP                                                                                |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                
|Issuance of common stock through forward sale agreements, net of expenses                    |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                
|Balance, October 31, 2015                                                                    |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                
|Schedule of Stock by Class                                                                   | As ofOctober 31, 2015, shares of common stock reserved for future issuance under various plans are as follows.In thousandsESPP145DRIP171ICP820Total1,136                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       
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|In thousands                                                                                 |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                
|ESPP                                                                                         | 145                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            
|DRIP                                                                                         | 171                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            
|ICP                                                                                          | 820                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            
|Total                                                                                        | 1,136                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          
|Schedule of Accumulated Other Comprehensive Income (Loss)                                    | Changes in each component of accumulated OCIL are presented below for the years endedOctober 31, 2015and2014.Changes in Accumulated OCIL(1)In thousands20152014Accumulated OCIL beginning balance, net of tax$(237)$(284)Hedging activities of equity method investments:OCIL before reclassifications, net of tax(1,601)355Amounts reclassified from accumulated OCIL, net of tax1,018(284)Total current period activity of hedging activities of equity method investments, net of tax(583)71Net current period benefit activities of equity method investments, net of tax(35)(24)Accumulated OCIL ending balance, net of tax$(855)$(237)(1)Amounts in parentheses indicate debits to accumulated OCIL.                                                                                                                                                                                                                                     
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|Changes in Accumulated OCIL(1)                                                              
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|In thousands                                                                                 |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                
|Accumulated OCIL beginning balance, net of tax                                               |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                
|Hedging activities of equity method investments:                                             |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                
|OCIL before reclassifications, net of tax                                                    |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                
|Amounts reclassified from accumulated OCIL, net of tax                                       |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                
|Total current period activity of hedging activities of equity method investments, net of tax |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                
|Net current period benefit activities of equity method investments, net of tax               |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                
|Accumulated OCIL ending balance, net of tax                                                  |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                
|(1)Amounts in parentheses indicate debits to accumulated OCIL.                              
|Reclassification out of Accumulated Other Comprehensive Income                               | A reconciliation of the effect on certain line items of net income on amounts reclassified out of each component of accumulated OCIL is presented below for the years endedOctober 31, 2015and2014.Reclassification Out ofAccumulated OCIL(1)Years EndedOctober 31Affected Line Items on Statement ofComprehensive IncomeIn thousands20152014Hedging activities of equity method investments$1,670$(461)Income from equity method investmentsIncome tax expense(652)177Income taxesNet hedging activities1,018$(284)Net benefit activities of equity method investments(58)(40)Income from equity method investmentsIncome tax expense2316Income taxesNet benefit activities(35)(24)Total reclassification for the period, net of tax$983$(308)(1)Amounts in parentheses indicate debits to accumulated OCIL.                                                                                                                                  
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|In thousands                                                                                 |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                
|Hedging activities of equity method investments                                              |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                
|Income tax expense                                                                           |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                
|Net hedging activities                                                                       |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                
|Net benefit activities of equity method investments                                          |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                
|Income tax expense                                                                           |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                
|Net benefit activities                                                                       |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                
|Total reclassification for the period, net of tax                                            |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                
|(1)Amounts in parentheses indicate debits to accumulated OCIL.                              

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