CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) (USD $) In Thousands	3 Months Ended
	Oct. 29, 2011	Oct. 30, 2010
OPERATING ACTIVITIES:
Net income	$ 12,966	$ 6,747
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	15,958	15,616
Bad debt expense, net	36	73
Gain on sale of fixed assets	(2,918)	(1,530)
Deferred income tax provision	3,520	550
Stock-based compensation	1,326	791
Amortization of debt issuance costs	323	311
Excess tax benefit from share-based awards	(175)	0
Change in operating assets and liabilities:
Accounts receivable, net	(2,047)	(2,446)
Costs and estimated earnings in excess of billings, net	(10,864)	1,793
Other current assets and inventory	(8,305)	(3,522)
Other assets	288	565
Income taxes receivable	5,398	2,559
Accounts payable	3,563	(1,653)
Accrued liabilities and insurance claims	364	(788)
Net cash provided by operating activities	19,433	19,066
INVESTING ACTIVITIES:
Capital expenditures	(20,857)	(13,449)
Proceeds from sale of assets	6,417	2,073
Changes in restricted cash	550	25
Net cash used in investing activities	(13,890)	(11,351)
FINANCING ACTIVITIES:
Principal payments on capital lease obligations	(75)	(29)
Debt issuance costs	0	(29)
Repurchases of common stock	0	(31,036)
Exercise of stock options and other	940	19
Restricted stock tax withholdings	(37)	0
Excess tax benefit from share-based awards	175	0
Net cash provided by (used in) financing activities	1,003	(31,075)
Net increase (decrease) in cash and equivalents	6,546	(23,360)
CASH AND EQUIVALENTS AT BEGINNING OF PERIOD	44,766	103,320
CASH AND EQUIVALENTS AT END OF PERIOD	51,312	79,960
Cash paid during the period for:
Interest	511	6,011
Income taxes	632	85
Purchases of capital assets included in accounts payable or other accrued liabilities at period end	$ 2,893	$ 491