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Stock Repurchase Plan (Details) (USD $) In Millions, except Share data, unless otherwise specified | 9 Months Ended | 74 Months Ended |  |
--- | --- | --- | --- | ---
Apr. 30, 2012 | Apr. 30, 2012 | Jul. 16, 2008 | Mar. 09, 2006
Stock Repurchase Plan [Abstract] |  |  |  |
Number of shares authorized to repurchase |  |  |  | 3,000,000
Additional number of shares authorized to repurchase |  |  | 3,000,000 |
Number of repurchased common shares | 203,377 | 4,468,181 |  |
Value of repurchased common stock | $ 7.9 | $ 170.7 |  |
Remaining shares available for repurchase under existing program | 1,531,819 | 1,531,819 |  |

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