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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, 2015 $ 401,409,000 $ 3,117,000 $ 427,083,000 $ 413,058,000 $ (441,849,000)
Common stock, beginning balance (in shares) at Jul. 31, 2015   31,165,401      
Treasury stock, beginning balance (in shares) at Jul. 31, 2015         15,033,317
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Equity-classified stock award compensation 2,084,000   2,084,000    
Proceeds from issuance of employee stock purchase plan shares 348,000 $ 2,000 346,000    
Proceeds from issuance of employee stock purchase plan shares (in shares)   20,131      
Common stock issued for net settlement of stock-based awards (73,000) $ 1,000 (74,000)    
Common stock issued for net settlement of stock-based awards (in shares)   9,925      
Cash dividends declared, net (9,692,000)     (9,692,000)  
Accrual of dividend equivalents, net of reversal (41,000)     (41,000)  
Net income tax shortfall from settlement of stock-based awards (43,000)   (43,000)    
Reversal of deferred tax assets associated with expired and unexercised stock-based awards (35,000)   (35,000)    
Net income 3,915,000     3,915,000  
Ending balance at Jan. 31, 2016 397,872,000 $ 3,120,000 429,361,000 407,240,000 $ (441,849,000)
Common stock, ending balance (in shares) at Jan. 31, 2016   31,195,457      
Treasury stock, ending balance (in shares) at Jan. 31, 2016         15,033,317
Beginning balance at Jul. 31, 2016 $ 470,401,000 $ 3,837,000 524,797,000 383,616,000 $ (441,849,000)
Common stock, beginning balance (in shares) at Jul. 31, 2016 38,367,997 38,367,997      
Treasury stock, beginning balance (in shares) at Jul. 31, 2016 15,033,317       15,033,317
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Equity-classified stock award compensation $ 1,989,000   1,989,000    
Proceeds from issuance of employee stock purchase plan shares 348,000 $ 3,000 345,000    
Proceeds from issuance of employee stock purchase plan shares (in shares)   33,226      
Issuance of restricted stock 0 $ 15,000 (15,000)    
Issuance of restricted stock (in shares)   144,899      
Common stock issued for net settlement of stock-based awards (244,000) $ 4,000 (248,000)    
Common stock issued for net settlement of stock-based awards (in shares)   40,354      
Cash dividends declared, net (9,351,000)     (9,351,000)  
Accrual of dividend equivalents, net of reversal (179,000)     (179,000)  
Net income tax shortfall from settlement of stock-based awards (257,000)   (257,000)    
Reversal of deferred tax assets associated with expired and unexercised stock-based awards (344,000)   (344,000)    
Net income 4,096,000     4,096,000  
Ending balance at Jan. 31, 2017 $ 466,459,000 $ 3,859,000 $ 526,267,000 $ 378,182,000 $ (441,849,000)
Common stock, ending balance (in shares) at Jan. 31, 2017 38,586,476 38,586,476      
Treasury stock, ending balance (in shares) at Jan. 31, 2017 15,033,317       15,033,317