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Condensed Consolidated Statements of Stockholders' Equity (USD $) | Total | Common Stock [Member] | Additional Paid-in Capital [Member] | Retained Earnings [Member] | Treasury Stock [Member]
--- | --- | --- | --- | --- | ---
Beginning balance at Jul. 31, 2012 | $ 429,401,000 | $ 2,893,000 | $ 361,458,000 | $ 404,227,000 | $ (339,177,000)
Treasury stock shares outstanding, beginning of period (in shares) at Jul. 31, 2012 |  |  |  |  | 11,564,059
Common stock shares issued, beginning of period (in shares) at Jul. 31, 2012 |  | 28,931,679 |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Equity-classified stock award compensation | 1,532,000 |  | 1,532,000 |  |
Equity-classified stock awards issued | 0 |  |  |  |
Proceeds from exercise of options | 446,000 | 3,000 | 443,000 |  |
Proceeds from exercise of options (in shares) |  | 25,800 |  |  |
Proceeds from issuance of employee stock purchase plan shares | 478,000 | 2,000 | 476,000 |  |
Proceeds from issuance of employee stock purchase plan shares (in shares) |  | 21,222 |  |  |
Cash dividends declared | (9,562,000) |  |  | (9,562,000) |
Net excess income tax benefit (income tax shortfall) from settlement of stock-based awards | 14,000 |  | 14,000 |  |
Reversal of deferred tax assets associated with expired and unexercised stock-based awards | (2,955,000) |  | (2,955,000) |  |
Repurchases of common stock | (10,477,000) |  |  |  | (10,477,000)
Repurchases of common stock (in shares) | 397,798 |  |  |  | 397,798
Net income | 9,800,000 |  |  | 9,800,000 |
Ending balance at Jan. 31, 2013 | 418,677,000 | 2,898,000 | 360,968,000 | 404,465,000 | (349,654,000)
Treasury stock shares outstanding, end of period (in shares) at Jan. 31, 2013 |  |  |  |  | 11,961,857
Common stock shares issued, end of period (in shares) at Jan. 31, 2013 |  | 28,978,701 |  |  |
Beginning balance at Jul. 31, 2013 | 404,062,000 | 2,907,000 | 363,888,000 | 403,398,000 | (366,131,000)
Treasury stock shares outstanding, beginning of period (in shares) at Jul. 31, 2013 | 12,608,501 |  |  |  | 12,608,501
Common stock shares issued, beginning of period (in shares) at Jul. 31, 2013 | 29,066,792 | 29,066,792 |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Equity-classified stock award compensation | 1,990,000 |  | 1,990,000 |  |
Equity-classified stock awards issued | 139,000 |  | 139,000 |  |
Proceeds from exercise of options | 2,559,000 | 10,000 | 2,549,000 |  |
Proceeds from exercise of options (in shares) |  | 95,425 |  |  |
Proceeds from issuance of employee stock purchase plan shares | 430,000 | 2,000 | 428,000 |  |
Proceeds from issuance of employee stock purchase plan shares (in shares) |  | 20,727 |  |  |
Issuance of common stock for vested performance shares, net of minimum withholding tax and deferrals | (25,000) | 0 | (25,000) |  |
Issuance of common stock for vested performance shares, net of minimum withholding tax and deferrals (in shares) |  | 3,496 |  |  |
Cash dividends declared | (9,260,000) |  |  | (9,260,000) |
Accrual of dividend equivalents | (51,000) |  |  | (51,000) |
Net excess income tax benefit (income tax shortfall) from settlement of stock-based awards | (155,000) |  | (155,000) |  |
Reversal of deferred tax assets associated with expired and unexercised stock-based awards | (1,925,000) |  | (1,925,000) |  |
Repurchases of common stock | (29,107,000) |  |  |  | (29,107,000)
Repurchases of common stock (in shares) | 935,992 |  |  |  | 935,992
Net income | 11,288,000 |  |  | 11,288,000 |
Ending balance at Jan. 31, 2014 | $ 379,945,000 | $ 2,919,000 | $ 366,889,000 | $ 405,375,000 | $ (395,238,000)
Treasury stock shares outstanding, end of period (in shares) at Jan. 31, 2014 | 13,544,493 |  |  |  | 13,544,493
Common stock shares issued, end of period (in shares) at Jan. 31, 2014 | 29,186,440 | 29,186,440 |  |  |

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