CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jan. 28, 2012	Jan. 29, 2011
OPERATING ACTIVITIES:
Net income	$ 16,451	$ 1,653
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	31,486	31,403
Bad debt expense, net	68	87
Gain on sale of fixed assets	(5,139)	(3,510)
Deferred income tax provision	3,498	1,960
Stock-based compensation	2,968	1,772
Amortization of debt issuance costs	646	2,402
Excess tax benefit from share-based awards	(979)	(180)
Change in operating assets and liabilities:
Accounts receivable, net	35,257	21,243
Costs and estimated earnings in excess of billings, net	7,919	12,925
Other current assets and inventory	(13,927)	(4,677)
Other assets	239	735
Income taxes receivable	5,332	(1,905)
Accounts payable	(799)	(7,876)
Accrued liabilities, insurance claims, and other liabilities	(12,169)	(8,476)
Net cash provided by operating activities	70,851	47,556
INVESTING ACTIVITIES:
Capital expenditures	(43,438)	(21,247)
Proceeds from sale of assets	8,942	5,554
Cash paid for acquisitions	0	(36,500)
Changes in restricted cash	550	25
Net cash used in investing activities	(33,946)	(52,168)
FINANCING ACTIVITIES:
Proceeds from issuance of 7.125% senior subordinated notes due 2021	0	187,500
Principal payments on long-term debt	(140)	(87,101)
Debt issuance costs	0	(4,355)
Repurchases of common stock	0	(34,239)
Exercise of stock options and other	4,013	506
Restricted stock tax withholdings	(328)	(196)
Excess tax benefit from share-based awards	979	180
Net cash provided by (used in) financing activities	4,524	62,295
Net increase (decrease) in cash and equivalents	41,429	57,683
CASH AND EQUIVALENTS AT BEGINNING OF PERIOD	44,766	103,320
CASH AND EQUIVALENTS AT END OF PERIOD	86,195	161,003
Cash paid during the period for:
Interest	7,727	8,448
Income taxes	2,486	2,775
Purchases of capital assets included in accounts payable or other accrued liabilities at period end	3,066	1,475
Accrued costs for debt issuance included in accounts payable and accrued liabilities at period end	$ 0	$ 600