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Stock-Based Compensation Summary of Restricted Stock Transactions (Details) (Restricted Stock, USD $)
In Thousands, except Per Share data, unless otherwise specified |
9 Months Ended | |
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Apr. 30, 2013
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Jul. 31, 2012
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Restricted Stock
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| Share-based Compensation Arrangement by Share-based Payment Award | ||
| Non-vested Restricted Stock Outstanding, Number (shares) | 122 | 132 |
| Non-vested Restricted Stock Outstanding, Weighted Average Grant Date Fair Value | $ 22.22 | $ 21.68 |
| Vested, Number (shares) | (29) | |
| Vested, Weighted Average Grant Date Fair Value | $ 21.74 | |
| Restricted Stock Granted, Number (shares) | 20 | |
| Granted, Weighted Average Grant Date Fair Value | $ 25.03 | |
| Forfeitures, Number (shares) | (1) | |
| Forfeiture, Weighted Average Grant Date Fair Value | $ 20.60 |