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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