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SIGNIFICANT ACCOUNTING POLICIES (Details) - USD ($) $ in Thousands	12 Months Ended
	Jul. 30, 2016	Aug. 01, 2015	Aug. 02, 2014
Basis of Presentation
Days in fiscal year	364 days	364 days	364 days
Days in interim quarter	91 days	91 days	91 days
Cash Equivalents
Maximum original maturity of securities to be classified as cash equivalents (in months)	3 months
Property and equipment
Interest capitalized	$ 400	$ 500	$ 900
Property and equipment
Property and equipment, gross	979,011	889,781
Less accumulated depreciation and amortization	362,406	317,329
Net property and equipment	616,605	572,452
Depreciation expense	61,100	55,000	$ 42,900
Land
Property and equipment
Property and equipment, gross	52,641	43,033
Buildings and improvements
Property and equipment
Property and equipment, gross	403,822	302,066
Leasehold improvements
Property and equipment
Property and equipment, gross	136,758	133,120
Warehouse equipment
Property and equipment
Property and equipment, gross	163,494	155,477
Office equipment
Property and equipment
Property and equipment, gross	55,915	57,519
Computer software
Property and equipment
Property and equipment, gross	146,766	130,652
Motor vehicles
Property and equipment
Property and equipment, gross	4,597	4,357
Construction in progress
Property and equipment
Property and equipment, gross	$ 15,018	$ 63,557
Minimum | Buildings and improvements
Property and equipment
Original estimated useful lives	20 years	20 years
Minimum | Leasehold improvements
Property and equipment
Original estimated useful lives	5 years	5 years
Minimum | Warehouse equipment
Property and equipment
Original estimated useful lives	3 years	3 years
Minimum | Office equipment
Property and equipment
Original estimated useful lives	3 years	3 years
Minimum | Computer software
Property and equipment
Original estimated useful lives	3 years	3 years
Minimum | Motor vehicles
Property and equipment
Original estimated useful lives	3 years	3 years
Maximum | Buildings and improvements
Property and equipment
Original estimated useful lives	40 years	40 years
Maximum | Leasehold improvements
Property and equipment
Original estimated useful lives	20 years	20 years
Maximum | Warehouse equipment
Property and equipment
Original estimated useful lives	30 years	30 years
Maximum | Office equipment
Property and equipment
Original estimated useful lives	10 years	10 years
Maximum | Computer software
Property and equipment
Original estimated useful lives	7 years	7 years
Maximum | Motor vehicles
Property and equipment
Original estimated useful lives	7 years	7 years

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