| **Consolidated Statements of Stockholders' Equity - USD ($) $ in Thousands** | Total       | Common Stock | Retained Earnings | Accumulated Other Comprehensive Income (Loss) |
|------------------------------------------------------------------------------|-------------|--------------|-------------------|-----------------------------------------------|
| Stockholders' Equity, beginning balance at Oct. 31, 2012                     | $ 1,027,004 | $ 442,461    | $ 584,848         | $ (305)                                       |
| **Comprehensive Income:**                                                    |        |         |              |                                          |
| Net income                                                                   | 134,417     |         | 134,417           |                                          |
| Other comprehensive income (loss)                                            | 21          |         |              | 21                                            |
| Comprehensive Income                                                         | 134,438     |         |              |                                          |
| Common Stock Issued                                                          | 119,552     | 119,552      |              |                                          |
| Expenses from Issuance of Common Stock                                       | (369)       | (369)        |              |                                          |
| Tax Benefit from Dividends Paid on ESOP Shares                               | 117         |         | 117               |                                          |
| Dividends Declared                                                           | (92,146)    |         | (92,146)          |                                          |
| Stockholders' Equity, ending balance at Oct. 31, 2013                        | 1,188,596   | 561,644      | 627,236           | (284)                                         |
| **Comprehensive Income:**                                                    |        |         |              |                                          |
| Net income                                                                   | 143,801     |         | 143,801           |                                          |
| Other comprehensive income (loss)                                            | 47          |         |              | 47                                            |
| Comprehensive Income                                                         | 143,848     |         |              |                                          |
| Common Stock Issued                                                          | 75,203      | 75,203       |              |                                          |
| Expenses from Issuance of Common Stock                                       | (12)        | (12)         |              |                                          |
| Tax Benefit from Dividends Paid on ESOP Shares                               | 118         |         | 118               |                                          |
| Dividends Declared                                                           | (99,151)    |         | (99,151)          |                                          |
| Stockholders' Equity, ending balance at Oct. 31, 2014                        | 1,308,602   | 636,835      | 672,004           | (237)                                         |
| **Income Loss Hedging Activities Of Equity Method Investments [Abstract]**   |        |         |              |                                          |
| Hedging activities of equity method investments                              | (213)       |         |              |                                          |
| Benefit activities of equity method investments                              | (24)        |         |              |                                          |
| Net income                                                                   | 137,011     |         | 137,011           |                                          |
| Other comprehensive income (loss)                                            | (618)       |         |              | (618)                                         |
| Comprehensive Income                                                         | 136,393     |         |              |                                          |
| Common Stock Issued                                                          | 84,966      | 84,966       |              |                                          |
| Expenses from Issuance of Common Stock                                       | (382)       | (382)        |              |                                          |
| Tax Benefit from Dividends Paid on ESOP Shares                               | 123         |         | 123               |                                          |
| Dividends Declared                                                           | (103,390)   |         | (103,390)         |                                          |
| Stockholders' Equity, ending balance at Oct. 31, 2015                        | 1,426,312   | $ 721,419    | $ 705,748         | $ (855)                                       |
| **Income Loss Hedging Activities Of Equity Method Investments [Abstract]**   |        |         |              |                                          |
| Hedging activities of equity method investments                              | (796)       |         |              |                                          |
| Benefit activities of equity method investments                              | $ (59)      |         |              |                                          |

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Amount of stockholder's equity (deficit) relating to benefit activities of equity method investments.
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The tax benefit resulting from dividends paid on stock held by an employee stock ownership plan.
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| - Definition
Accumulated change, net of tax, in accumulated gains and losses from derivative instruments designated and qualifying as the effective portion of cash flow hedges. Includes an entity's share of an equity investee's Increase or Decrease in deferred hedging gains or losses.
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| - Definition
Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income, attributable to parent entity. Excludes changes in equity resulting from investments by owners and distributions to owners.
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| - Definition
Amount of paid and unpaid common stock dividends declared with the form of settlement in cash.
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The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.
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| - Definition
Amount after tax and reclassification adjustments of other comprehensive income (loss).
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| - Definition
Equity impact of the value of new stock issued during the period. Includes shares issued in an initial public offering or a secondary public offering.
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| - Definition
Amount of stockholders' equity (deficit), net of receivables from officers, directors, owners, and affiliates of the entity, attributable to both the parent and noncontrolling interests. Amount excludes temporary equity. Alternate caption for the concept is permanent equity.
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