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Long-Term Debt (Schedule Of Long-Term Debt) (Details) (USD $)
 9 Months Ended
Apr. 30, 2012
Jul. 31, 2011
Apr. 30, 2011
Apr. 25, 2011
Schedule of Capitalization, Long-term Debt [Line Items]        
Total debt $ 490,876,000 $ 491,743,000 $ 535,836,000  
Less: Current maturities 1,119,000 [1] 1,045,000 [1] 45,357,000 [1]  
Long-term debt 489,757,000 490,698,000 490,479,000  
Credit Facility Revolver [Member]
        
Schedule of Capitalization, Long-term Debt [Line Items]        
Total debt          
Year of maturity 2016 [2]      
Industrial Development Bonds [Member]
        
Schedule of Capitalization, Long-term Debt [Line Items]        
Total debt 41,200,000 41,200,000 41,200,000  
Year of maturity 2020 [2]      
Employee Housing Bonds [Member]
        
Schedule of Capitalization, Long-term Debt [Line Items]        
Total debt 52,575,000 52,575,000 52,575,000  
Fiscal year maturity, end 2039      
6.50% Notes [Member]
        
Schedule of Capitalization, Long-term Debt [Line Items]        
Total debt 390,000,000 [3] 390,000,000 [3] 390,000,000 [3]  
Year of maturity 2019 [2],[3]      
Debt instrument, stated percentage 6.50%      
Issuance of 6.50% senior subordinated notes       390,000,000
6.75% Notes [Member]
        
Schedule of Capitalization, Long-term Debt [Line Items]        
Total debt      43,937,000  
Year of maturity — [2]      
Debt instrument, stated percentage 6.75%      
Other [Member]
        
Schedule of Capitalization, Long-term Debt [Line Items]        
Total debt $ 7,101,000 $ 7,968,000 $ 8,124,000  
Fiscal year maturity, end 2029      
Minimum [Member] | Employee Housing Bonds [Member]
        
Schedule of Capitalization, Long-term Debt [Line Items]        
Fiscal year maturity, start 2027 [2]      
Minimum [Member] | Other [Member]
        
Schedule of Capitalization, Long-term Debt [Line Items]        
Fiscal year maturity, start 2012 [2]      
[1] Current maturities represent principal payments due in the next 12 months.
[2] Maturities are based on the Company's July 31 fiscal year end.
[3] On April 25, 2011, the Company completed a private offering for $390.0 million of 6.50% Notes. Pursuant to the registration rights agreement executed as part of the offering of the 6.50% Notes, the Company agreed to file a registration statement for an exchange offer registered under the Securities Act of 1933. The registration statement was declared effective on November 16, 2011, and on November 17, 2011, the Company commenced its offer to exchange up to $390.0 million principal amount of newly issued 6.50% Notes, registered under the Securities Act of 1933, for a like principal amount of its outstanding privately placed 6.50% Notes. The exchange offer expired on December 16, 2011 and all of the 6.50% Notes were tendered and exchanged for the new substantially identical registered notes.