Long-Term Debt (Schedule Of Debt Instruments) (Details) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jan. 31, 2015	Jul. 31, 2014	Jan. 31, 2014
Total debt	$ 635,935	$ 626,622	$ 799,284
Less: Current maturities	1,196	1,022	965
Long-term debt	634,739	625,600	798,319
Fiscal year maturity	2019
Stated percentage in the debt instrument	6.50%
Credit Facility Revolver [Member]
Total debt	0	0	0
Fiscal year maturity	2019
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	215,000	215,000	390,000
Long-term debt	215,000
Fiscal year maturity	2019
Stated percentage in the debt instrument	6.50%
Long term debt interest rate	6.50%
Canyons Obligation [Member]
Total debt	314,657	311,858	309,093
Fiscal year maturity	2063
Other [Member]
Total debt	$ 12,503	$ 5,989	$ 6,416
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, 2015