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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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