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SIGNIFICANT ACCOUNTING POLICIES (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended	12 Months Ended
	Apr. 28, 2018	Jul. 28, 2018	Jul. 29, 2017	Jul. 30, 2016
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
Use of Estimates
Increase (Decrease) in Accounts Payable	$ 20,900	$ 4,395	$ 90,217	$ 14,379
Change in Accounting Estimate, Effect of Change on Net Income	$ 13,900
Change in Accounting Estimate, Effect of Change on Diluted Earnings Per Share	$ 0.27
Property and equipment
Interest capitalized		0		400
Property and equipment
Property and equipment, gross		1,059,329	1,027,845
Less accumulated depreciation and amortization		488,183	425,755
Net property and equipment		571,146	602,090
Depreciation expense		71,500	69,800	$ 61,100
Land
Property and equipment
Property and equipment, gross		52,929	52,989
Buildings and improvements
Property and equipment
Property and equipment, gross		446,665	396,733
Leasehold improvements
Property and equipment
Property and equipment, gross		106,014	138,466
Warehouse equipment
Property and equipment
Property and equipment, gross		185,669	173,591
Office equipment
Property and equipment
Property and equipment, gross		85,734	95,794
Computer software
Property and equipment
Property and equipment, gross		155,329	147,647
Motor vehicles
Property and equipment
Property and equipment, gross		4,884	4,657
Construction in progress
Property and equipment
Property and equipment, gross		$ 22,105	$ 17,968
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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