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Stockholders' Equity (Details) (USD $) | 0 Months Ended | 1 Months Ended | 3 Months Ended | 6 Months Ended
--- | --- | --- | --- | ---
Feb. 07, 2013 | Dec. 15, 2011 | Dec. 31, 2012 | Apr. 30, 2013 | Jan. 31, 2013 | Oct. 31, 2012 | Jul. 31, 2012 | Apr. 30, 2012 | Jan. 31, 2012 | Apr. 30, 2013 | Apr. 30, 2012
Stockholders' Equity Note [Abstract] |  |  |  |  |  |  |  |  |  |  |
Share Repurchase Program, maximum amount authorized |  | $ 150,000,000 | $ 300,000,000 |  |  |  |  |  |  |  |
Share Repurchase Program, remaining authorized amount |  |  |  | 184,500,000 |  |  |  |  |  |  |
Number of common stock repurchased, shares |  |  |  | 0 | 460,000 | 0 | 321,000 | 0 | 663,000 |  |
Cost of common stock repurchased |  |  |  |  | 44,400,000 |  | 25,000,000 |  | 46,100,000 |  |
Average purchase price per share |  |  |  |  | $ 96.34 |  | $ 77.89 |  | $ 69.60 |  |
Dividends on common stock | $ 1,400,000 |  |  |  |  |  |  |  |  | $ 1,449,000 | $ 1,421,000
Cash dividend, per share | $ 0.03 |  |  |  |  |  |  |  |  |  |
Dividends payable, date of record | Jan. 25, 2013 |  |  |  |  |  |  |  |  |  |

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