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Stockholder's Investment (Details 1) (USD $)
In Thousands, except Share data
12 Months Ended
Jul. 31, 2011
Jul. 31, 2010
Jul. 31, 2009
Jul. 31, 2008
Schedule of Stockholders' Investment        
Beginning balance, Value $ (2,829) $ (4,492) $ (5,495)  
Sale of shares at cost (46) 289 (432)  
Issuance of restricted stock (2,835)      
Amortization of restricted stock 846 1,374 1,435  
Ending balance, Value (4,864) (2,829) (4,492)  
Unearned Restricted Stock [Member]
       
Schedule of Stockholders' Investment        
Beginning balance, Value (3,373) (4,747) (6,182)  
Issuance of restricted stock (2,835)      
Amortization of restricted stock 846 1,374 1,435  
Ending balance, Value (5,362) (3,373) (4,747)  
Deferred Compensation [Member]
       
Schedule of Stockholders' Investment        
Beginning balance, Value 12,847 13,282 13,643  
Beginning balance, shares 614,988 671,650 690,539  
Sale of shares at cost (1,421) (1,247) (1,655)  
Purchase of shares at cost 666 813 1,294  
Ending balance, shares 560,078      
Ending balance, Value 12,092      
Shares Held Rabbi Trust At Cost [Member]
       
Schedule of Stockholders' Investment        
Beginning balance, Value (12,304) (13,027) (12,956)  
Beginning balance, shares   614,988 671,650 690,539
Sale of shares at cost 1,375 1,536 1,223  
Purchase of shares at cost (666) (813) (1,294)  
Ending balance, shares 560,078      
Ending balance, Value $ (11,595)