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Long-Term Debt (Schedule Of Debt Instruments) (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 12 Months Ended
Apr. 30, 2013
Jul. 31, 2012
Apr. 30, 2012
Total debt $ 489,758 $ 490,765 $ 490,876
Less: Current maturities 518 990 1,119
Long-term debt 489,240 489,775 489,757
Fiscal year maturity 2019    
Stated percentage in the debt instrument 6.50%    
Credit Facility Revolver [Member]
     
Total debt 0 0 0
Fiscal year maturity 2016    
Industrial Development Bonds [Member]
     
Total debt 41,200 41,200 41,200
Long-term debt 41,200    
Fiscal year maturity 2020    
Employee Housing Bonds [Member]
     
Total debt 52,575 52,575 52,575
6.50% Notes [Member]
     
Total debt 390,000 390,000 390,000
Long-term debt 390,000    
Fiscal year maturity 2019    
Stated percentage in the debt instrument 6.50%    
Long term debt interest rate   6.50%  
Other [Member]
     
Total debt $ 5,983 $ 6,990 $ 7,101
Maximum [Member] | Employee Housing Bonds [Member]
     
Fiscal year maturity, end May 01, 2039    
Maximum [Member] | Other [Member]
     
Fiscal year maturity, end Jul. 31, 2029    
Minimum [Member] | Employee Housing Bonds [Member]
     
Fiscal year maturity, start Jun. 01, 2027    
Minimum [Member] | Other [Member]
     
Fiscal year maturity, start Jul. 31, 2013