PROPERTY AND EQUIPMENT (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Jul. 28, 2012	Jul. 30, 2011	Jul. 31, 2010
Depreciation and repairs and maintenance expenses [Abstract]
Depreciation expense	$ 56,187	$ 55,727	$ 57,177
Repairs and maintenance expense	15,623	15,130	14,634
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	435,872	423,961
Accumulated Depreciation, Property, Plant, and Equipment	(277,625)	(274,522)
Property, Plant and Equipment, Net, Total	158,247	149,439
Land [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	2,915	3,165
Buildings [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	10,630	11,707
Buildings [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life	15 years
Buildings [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life	35 years
Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	4,674	4,554
Leasehold Improvements [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life	3 years
Leasehold Improvements [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life	15 years
Vehicles-New [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	220,669	216,648
Vehicles-New [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life	3 years
Vehicles-New [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life	5 years
Computer Hardware and Software [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	57,965	54,998
Computer Hardware and Software [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life	3 years
Computer Hardware and Software [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life	10 years
Office Furniture and Equipment [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	5,552	5,477
Office Furniture and Equipment [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life	3 years
Office Furniture and Equipment [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life	5 years
Equipment and Machinery [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	$ 133,467	$ 127,412
Equipment and Machinery [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life	2 years
Equipment and Machinery [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life	10 years