Income Taxes (Schedule Of Temporary Differences That Give Rise To Deferred Tax Assets And Liabilities) (Details) - USD ($) $ in Thousands	Jul. 31, 2015	Jul. 31, 2014
Income Tax Disclosure [Abstract]
Accrued expenses	$ 10,566	$ 11,118
Compensation and retirement plans	39,090	32,317
NOL and tax credit carryforwards	4,353	3,471
LIFO and inventory reserves	6,891	5,482
Other	4,993	4,470
Deferred tax assets, gross	65,893	56,858
Valuation allowance	(2,737)	(3,471)
Net deferred tax assets	63,156	53,387
Depreciation and amortization	(50,628)	(49,901)
Other	(2,359)	(1,025)
Deferred tax liabilities	(52,987)	(50,926)
Prepaid tax assets	4,421	4,392
Net tax asset	$ 14,590	$ 6,853