Long-Term Debt (Schedule Of Debt Instruments) (Details) - USD ($) $ in Thousands	3 Months Ended
	Oct. 31, 2015	Jul. 31, 2015	May. 01, 2015	Oct. 31, 2014
Total debt	$ 830,377	$ 816,830		$ 820,260
Less: Current maturities	13,319	10,154		1,022
Long-term debt	$ 817,058	806,676		819,238
Stated percentage in the debt instrument	6.50%
Credit Facility Revolver [Member]
Total debt	$ 197,500	185,000		183,000
Fiscal year maturity	2020
Term Loan [Member]
Total debt	$ 250,000	250,000		0
Fiscal year maturity	2020
Industrial Development Bonds [Member]
Total debt	$ 0	0		41,200
Fiscal year maturity	2020
Employee Housing Bonds [Member]
Total debt	$ 52,575	52,575		52,575
6.50% Notes [Member]
Total debt	$ 0	0	$ 0	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	$ 318,866	317,455		313,258
Fiscal year maturity	2063
Other [Member]
Total debt	$ 11,436	$ 11,800		$ 15,227
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