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Long-Term Debt (Schedule Of Debt Instruments) (Details) (USD $)
 3 Months Ended 9 Months Ended
Apr. 30, 2014
Apr. 30, 2014
Apr. 30, 2013
Jul. 31, 2013
Total debt $ 800,102,000 $ 800,102,000 $ 489,758,000 $ 796,922,000
Less: Current maturities 879,000 879,000 518,000 994,000
Long-term debt 799,223,000 799,223,000 489,240,000 795,928,000
Fiscal year maturity   2019    
Stated percentage in the debt instrument 6.50% 6.50%    
Credit Facility Revolver [Member]
        
Total debt 0 0 0 0
Fiscal year maturity   2019    
Industrial Development Bonds [Member]
        
Total debt 41,200,000 41,200,000 41,200,000 41,200,000
Long-term debt 41,200,000 41,200,000    
Fiscal year maturity   2020    
Employee Housing Bonds [Member]
        
Total debt 52,575,000 52,575,000 52,575,000 52,575,000
6.50% Notes [Member]
        
Total debt 390,000,000 390,000,000 390,000,000 390,000,000
Long-term debt 390,000,000 390,000,000    
Fiscal year maturity   2019    
Stated percentage in the debt instrument 6.50% 6.50%    
Long term debt interest rate     6.50%  
Debt Instrument, Redemption Notice Submitted Date Jun. 05, 2014      
Extinguishment of Debt, Amount 175,000,000      
Debt Instrument, Redemption Percentage 104.875%      
Debt Instrument, Redemption Date Jul. 07, 2014      
Premium on early redemption 4.875%      
Redemption Premium 8,500,000      
Write off of Deferred Debt Issuance Cost 2,300,000      
Debt Instrument, Principal Outstanding Following Partial Redemption 215,000,000      
Canyons Obligation [Member]
        
Total debt 310,472,000 310,472,000 0 306,320,000
Long-term debt 310,472,000 310,472,000    
Fiscal year maturity   2063    
Other [Member]
        
Total debt 5,855,000 5,855,000 5,983,000 6,827,000
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, 2014    
Revolving Credit Facility [Member]
        
Fiscal year maturity   March 2019    
Debt Instrument, Description of Variable Rate Basis   LIBOR plus 1.50%    
Line of Credit Facility, Commitment Fee Percentage   0.30%    
Line of Credit Facility, Maximum Borrowing Capacity $ 400,000,000 $ 400,000,000