Income Taxes (Schedule Of Temporary Differences That Give Rise To Deferred Tax Assets And Liabilities) (Details) (USD $) In Thousands, unless otherwise specified	Jul. 31, 2013	Jul. 31, 2012
Income Taxes [Abstract]
Accrued expenses	$ 11,580	$ 10,666
Compensation and retirement plans	23,578	52,986
NOL carryforwards	3,279	3,146
LIFO and inventory reserves	5,037	2,796
Other	3,890	3,697
Deferred tax assets, gross	47,364	73,291
Valuation allowance	(3,228)	(2,945)
Net deferred tax assets	44,136	70,346
Depreciation and amortization	(45,737)	(38,796)
Other	(663)	(394)
Deferred tax liabilities	(46,400)	(39,190)
Prepaid tax assets	4,015	4,251
Net tax asset	$ 1,751	$ 35,407