INCOME TAXES (Details) - USD ($) $ in Thousands	12 Months Ended
	Jul. 29, 2017	Jul. 30, 2016	Aug. 01, 2015
Income Tax Disclosure [Abstract]
Income before income taxes from U.S. operations	$ 211,500	$ 208,800	$ 227,400
Income before income taxes, foreign operations	2,900	(600)	2,400
Current
U.S. Federal	70,669	57,157	60,848
State & Local	14,653	12,718	14,119
Foreign	837	101	729
Total income tax expense	86,159	69,976	75,696
Deferred
U.S. Federal	(1,874)	11,383	13,209
State & Local	(82)	1,310	2,098
Foreign	65	(213)	32
Total income tax expense	(1,891)	12,480	15,339
Total
U.S. Federal	68,795	68,540	74,057
State & Local	14,571	14,028	16,217
Foreign	902	(112)	761
Total income tax expense	$ 84,268	$ 82,456	$ 91,035
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	$ 75,048	$ 72,878	$ 80,419
State and local income tax, net of Federal income tax benefit	9,694	9,412	10,547
Non-deductible expenses	1,951	1,549	1,551
Tax effect of share-based compensation	29	86	165
General business credits	(915)	(135)	(365)
Other, net	(1,539)	(1,334)	(1,282)
Total income tax expense	84,268	82,456	91,035
Allocation of total income tax expense (benefit)
Income tax expense	84,268	82,456	91,035
Tax deficit associated with stock plans	1,320	83
Stockholders' equity, difference between compensation expense for tax purposes and amounts recognized for financial statement purposes			(2,746)
Other comprehensive income	3,222	(2,050)	(293)
Total income tax expense	88,810	80,489	87,996
Deferred tax assets:
Inventories, principally due to additional costs inventoried for tax purposes	9,416	10,682
Compensation and benefits related	35,482	25,453
Accounts receivable, principally due to allowances for uncollectible accounts	5,639	4,734
Accrued expenses	4,466	7,519
Net operating loss carryforwards	940	1,059
Deferred Tax Assets, Hedging Transactions	0	2,343
Other deferred tax assets	0	29
Total gross deferred tax assets	55,943	51,819
Less valuation allowance	0	0
Net deferred tax assets	55,943	51,819
Deferred tax liabilities:
Plant and equipment, principally due to differences in depreciation	59,414	62,030
Intangible assets	53,633	48,996
Deferred Tax Liabilities, Derivatives	876	0
Other	218	785
Total deferred tax liabilities	114,141	111,811
Deferred Tax Liabilities, Net	(58,198)	(59,992)
Current deferred income tax assets	40,635	35,228
Deferred Tax Liabilities, Net, Noncurrent	(98,833)	$ (95,220)
Unrecognized Tax Benefits, Decrease Resulting from Current Period Tax Positions	$ 0		$ 500