|**Stockholders' Equity (Tables)**                                                            | 3 Months Ended                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               
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|**Stockholders' Equity Note [Abstract]**                                                     |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              
|Schedule Of Capital Stock                                                                    | Changes in common stock for thethreemonths endedJanuary 31, 2015are as follows.In thousandsSharesAmountBalance, October 31, 201478,531$636,835Issued to participants in the Employee Stock Purchase Plan (ESPP)7279Issued to participants in the Dividend Reinvestment and Stock Purchase Plan1264,781Issued to participants in the Incentive Compensation Plan (ICP)1033,935Costs from issuance of common stock(137)Balance, January 31, 201578,767$645,693                                                                                                                                                                                                                                                                                                                                                                                                 
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|In thousands                                                                                 | Shares                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       
|Balance, October 31, 2014                                                                    | 78,531                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       
|Issued to participants in the Employee Stock Purchase Plan (ESPP)                            | 7                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            
|Issued to participants in the Dividend Reinvestment and Stock Purchase Plan                  | 126                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          
|Issued to participants in the Incentive Compensation Plan (ICP)                              | 103                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          
|Costs from issuance of common stock                                                          |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              
|Balance, January 31, 2015                                                                    | 78,767                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       
|Dividends Declared                                                                           | Cash dividends paid per share of common stock for thethreemonths endedJanuary 31, 2015and2014are as follows.Three Months20152014Cash dividends paid per share of common stock$.32$.31                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        
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|                                                                                             | Three Months                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 
|                                                                                             | 2015                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         
|Cash dividends paid per share of common stock                                                | $                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            
|Schedule Of Accumulated Other Comprehensive Income (Loss)                                    | Changes in each component of accumulated OCIL are presented below for thethreemonths endedJanuary 31, 2015and2014.Changes in Accumulated OCIL(1)Three MonthsIn thousands20152014Accumulated OCIL beginning balance, net of tax$(237)$(284)Hedging activities of equity method investments:OCIL before reclassifications, net of tax(944)174Amounts reclassified from accumulated OCIL, net of tax117137Total current period activity of hedging activities of equity method investments, net of tax(827)311Net current period benefit activities of equity method investments, net of tax—Accumulated OCIL ending balance, net of tax$(1,064)$27(1)Amounts in parentheses indicate debits to accumulated OCIL.                                                                                                                                               
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|                                                                                             | Changes in Accumulated OCIL(1)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               
|                                                                                             | Three Months                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 
|In thousands                                                                                 | 2015                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         
|Accumulated OCIL beginning balance, net of tax                                               | $                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            
|Hedging activities of equity method investments:                                             |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              
|OCIL before reclassifications, net of tax                                                    | (944                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         
|Amounts reclassified from accumulated OCIL, net of tax                                       | 117                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          
|Total current period activity of hedging activities of equity method investments, net of tax | (827                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         
|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 thethreemonths endedJanuary 31, 2015and2014.Reclassification Out ofAccumulated OCIL(1)Affected Line Items on CondensedStatements of Operations and Comprehensive IncomeThree MonthsIn thousands20152014Hedging activities of equity method investments$192$225Income from equity method investmentsIncome tax expense(75)(88)Income taxesHedging activities of equity method investments117137Net benefit activities of equity method investments—Income from equity method investmentsIncome tax expense—Income taxesNet benefit activities of equity method investments—Total reclassification for the period, net of tax$117$137(1)Amounts in parentheses indicate debits to accumulated OCIL.
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|                                                                                             | Reclassification Out ofAccumulated OCIL(1)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   
|                                                                                             | Three Months                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 
|In thousands                                                                                 | 2015                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         
|Hedging activities of equity method investments                                              | $                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            
|Income tax expense                                                                           | (75                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          
|Hedging activities of equity method investments                                              | 117                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          
|Net benefit activities of equity method investments                                          | —                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            
|Income tax expense                                                                           | —                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            
|Net benefit activities of equity method investments                                          | —                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            
|Total reclassification for the period, net of tax                                            | $                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            
|(1)Amounts in parentheses indicate debits to accumulated OCIL.                              

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