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Stock-Based Compensation Performance Shares, RSUs, Restricted Stock and Share Unit Awards (Details) (USD $) |  |  | 3 Months Ended | 6 Months Ended | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Jan. 31, 2014 | Jul. 31, 2013 | Jan. 31, 2014 Performance Shares, RSUs, Restricted Stock and Share Units | Oct. 31, 2013 Performance Shares, RSUs, Restricted Stock and Share Units | Jan. 31, 2014 Performance Shares Granted prior to fiscal 2014 | Jan. 31, 2014 Performance Shares Granted during the period | Jan. 31, 2014 Performance Shares Granted during the period | Jan. 31, 2014 Performance Shares Granted in fiscal 2012 | Jan. 31, 2014 RSUs and restricted stock Non-Employee Director [Member] | Jan. 31, 2014 RSUs and restricted stock Employees [Member] | Jan. 31, 2014 Dividend Equivalents | Jul. 31, 2013 Dividend Equivalents
Awards (in Shares) |  |  |  |  |  |  |  |  |  |  |  |
Outstanding, Beginning Balance |  |  | 165,992 | 102,334 |  |  |  |  |  |  |  |
Granted |  |  | 4,988 | 68,167 |  |  |  | 35,003 |  |  |  |
Converted to common stock |  |  | 0 | (4,509) |  |  |  |  |  |  |  |
Forfeited |  |  | (9,570) |  |  |  |  |  |  |  |  |
Outstanding, Ending Balance |  |  | 161,410 | 165,992 |  |  |  |  |  |  |  |
Vested, Ending Balance |  |  | 12,529 |  |  |  |  |  |  |  |  |
Vested and Expected to Vest, Ending Balance |  |  | 156,337 |  |  |  |  |  |  |  |  |
Weighted Average Grant Date Fair Value |  |  |  |  |  |  |  |  |  |  |  |
Outstanding, Beginning Balance |  |  | $ 25.28 | $ 25.80 |  |  |  |  |  |  |  |
Granted |  |  | $ 31.32 | $ 24.58 |  |  |  |  |  |  |  |
Converted to common stock |  |  | $ 0.00 | $ 26.25 |  |  |  |  |  |  |  |
Forfeited |  |  | $ 24.82 |  |  |  |  |  |  |  |  |
Outstanding, Ending Balance |  |  | $ 25.50 | $ 25.28 |  |  |  |  |  |  |  |
Vested, Ending Balance |  |  | $ 26.93 |  |  |  |  |  |  |  |  |
Vested and Expected to Vest, Ending Balance |  |  | $ 25.51 |  |  |  |  |  |  |  |  |
Aggregate Intrinsic Value |  |  |  |  |  |  |  |  |  |  |  |
Outstanding, Ending Balance |  |  | $ 4,910,000 |  |  |  |  |  |  |  |  |
Vested, Ending Balance |  |  | 381,000 |  |  |  |  |  |  |  |  |
Vested and Expected to Vest, Ending Balance |  |  | 4,756,000 |  |  |  |  |  |  |  |  |
Additional Disclosures |  |  |  |  |  |  |  |  |  |  |  |
Vesting period (in years) |  |  |  |  | 5 years 3 months 19 days | 3 years | 3 years |  | 3 years | 5 years |  |
Granted |  |  | 4,988 | 68,167 |  |  |  | 35,003 |  |  |  |
Vested |  |  |  |  |  |  |  | 6,996 |  |  |  |
Converted into common stock, net of reduction of shares for minimum tax withholding and deferral requirements |  |  |  |  |  |  |  | 3,496 |  |  |  |
Reduction of shares retained to satisfy minimum tax withholding |  |  |  |  |  |  |  | 1,013 |  |  |  |
Reduction of shares retained for deferral requirements |  |  |  |  |  |  |  | 2,487 |  |  |  |
Accrued at period end | $ 275,269,000 | $ 277,753,000 |  |  |  |  |  |  |  |  | $ 58,000 | $ 7,000

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