CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Apr. 28, 2012	Apr. 30, 2011
OPERATING ACTIVITIES:
Net income	$ 26,096	$ 3,142
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	47,047	46,894
Bad debt expense, net	180	12
Gain on sale of fixed assets	(12,578)	(6,810)
Write-off of deferred financing costs	0	2,337
Deferred	4,330	4,494
Stock-based compensation	4,901	3,086
Amortization of debt issuance costs	971	975
Excess tax benefit from share-based awards	(1,361)	(251)
Change in operating assets and liabilities:
Accounts receivable, net	16,734	14,590
Costs and estimated earnings in excess of billings, net	(14,789)	(6,073)
Other current assets and inventory	(12,427)	(3,361)
Other assets	(146)	807
Income taxes receivable	9,383	(3,210)
Accounts payable	1,903	(1,144)
Accrued liabilities, insurance claims, and other liabilities	(1,791)	(3,398)
Net cash provided by operating activities	68,453	52,090
INVESTING ACTIVITIES:
Capital expenditures	(62,790)	(32,255)
Proceeds from sale of assets	20,528	9,690
Cash paid for acquisitions	0	(36,500)
Changes in restricted cash	550	216
Net cash used in investing activities	(41,712)	(58,849)
FINANCING ACTIVITIES:
Proceeds from issuance of 7.125% senior subordinated notes due 2021	0	187,500
Principal payments on long-term debt	(186)	(135,667)
Debt issuance costs	0	(5,105)
Repurchases of common stock	(10,942)	(55,491)
Exercise of stock options and other	5,299	1,174
Restricted stock tax withholdings	(329)	(196)
Excess tax benefit from share-based awards	1,361	251
Net cash provided by (used in) financing activities	(4,797)	(7,534)
Net increase (decrease) in cash and equivalents	21,944	(14,293)
CASH AND EQUIVALENTS AT BEGINNING OF PERIOD	44,766	103,320
CASH AND EQUIVALENTS AT END OF PERIOD	66,710	89,027
Cash paid during the period for:
Interest	8,220	10,327
Income taxes	2,697	2,786
Purchases of capital assets included in accounts payable or other accrued liabilities at period end	$ 1,683	$ 2,138