INCOME TAXES (Details) - USD ($) $ in Thousands	12 Months Ended
	Aug. 01, 2015	Aug. 02, 2014	Aug. 03, 2013
Income Tax Disclosure [Abstract]
Income before income taxes from U.S. operations	$ 227,400	$ 201,100	$ 166,700
Income before income taxes, foreign operations	2,400	6,300	7,400
Current
U.S. Federal	60,848	66,953	44,095
State & Local	14,119	12,660	13,366
Foreign	729	1,432	2,021
Total income tax expense	75,696	81,045	59,482
Deferred
U.S. Federal	13,209	(894)	7,029
State & Local	2,098	1,452	(364)
Foreign	32	323	115
Total income tax expense	15,339	881	6,780
Total
U.S. Federal	74,057	66,059	51,124
State & Local	16,217	14,112	13,002
Foreign	761	1,755	2,136
Total income tax expense	$ 91,035	$ 81,926	$ 66,262
U.S. statutory income tax rate (as a percent)	35.00%	35.00%	35.00%
Income tax expense (benefit), income tax reconciliation
Computed expected tax expense	$ 80,419	$ 72,593	$ 60,940
State and local income tax, net of Federal income tax benefit	10,547	9,135	7,501
Non-deductible expenses	1,551	1,333	1,516
Tax effect of share-based compensation	165	160	134
General business credits	(365)	(114)	(1,374)
Other, net	(1,282)	(1,181)	(2,455)
Total income tax expense	91,035	81,926	66,262
Allocation of total income tax expense (benefit)
Income tax expense	91,035	81,926	66,262
Stockholders' equity, difference between compensation expense for tax purposes and amounts recognized for financial statement purposes	(2,746)	(2,601)	(1,952)
Other comprehensive income	(293)	0	0
Total income tax expense	87,996	79,325	$ 64,310
Deferred tax assets:
Inventories, principally due to additional costs inventoried for tax purposes	9,034	7,532
Compensation and benefits related	23,651	24,129
Accounts receivable, principally due to allowances for uncollectible accounts	3,279	3,000
Accrued expenses	9,077	10,438
Net operating loss carryforwards	1,177	1,295
Other deferred tax assets	313	21
Total gross deferred tax assets	46,531	46,415
Less valuation allowance	0	0
Net deferred tax assets	46,531	46,415
Deferred tax liabilities:
Plant and equipment, principally due to differences in depreciation	47,872	36,494
Intangible assets	31,955	28,124
Other	15	274
Total deferred tax liabilities	79,842	64,892
Net deferred tax liabilities	(33,311)	(18,477)
Current deferred income tax assets	32,333	32,518
Non-current deferred income tax liabilities	(65,644)	(50,995)
Net deferred tax liabilities	$ (33,311)	$ (18,477)