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SIGNIFICANT ACCOUNTING POLICIES (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Jul. 29, 2017 | Jul. 30, 2016 | Aug. 01, 2015
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 | $ 0 | $ 400 | $ 500
Property and equipment |  |  |
Property and equipment, gross | 1,027,845 | 979,011 |
Less accumulated depreciation and amortization | 425,755 | 362,406 |
Net property and equipment | 602,090 | 616,605 |
Depreciation expense | 69,800 | 61,100 | $ 55,000
Land |  |  |
Property and equipment |  |  |
Property and equipment, gross | 52,989 | 52,641 |
Buildings and improvements |  |  |
Property and equipment |  |  |
Property and equipment, gross | 396,733 | 403,822 |
Leasehold improvements |  |  |
Property and equipment |  |  |
Property and equipment, gross | 138,466 | 136,758 |
Warehouse equipment |  |  |
Property and equipment |  |  |
Property and equipment, gross | 173,591 | 163,494 |
Office equipment |  |  |
Property and equipment |  |  |
Property and equipment, gross | 95,794 | 55,915 |
Computer software |  |  |
Property and equipment |  |  |
Property and equipment, gross | 147,647 | 146,766 |
Motor vehicles |  |  |
Property and equipment |  |  |
Property and equipment, gross | 4,657 | 4,597 |
Construction in progress |  |  |
Property and equipment |  |  |
Property and equipment, gross | $ 17,968 | $ 15,018 |
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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