Supplemental Consolidating Financial Statements Balance Sheet (Details) (USD $) In Thousands, unless otherwise specified	Jan. 26, 2013	Dec. 03, 2012	Jul. 28, 2012	Jan. 28, 2012	Jul. 30, 2011
CURRENT ASSETS:
Cash and equivalents	$ 22,590		$ 52,581	$ 86,195	$ 44,766
Accounts receivable, net	227,413		141,788
Costs and estimated earnings in excess of billings	148,502		127,321
Inventories	34,909		26,274
Deferred tax assets, net	15,422		15,633
Income taxes receivable	6,925		4,884
Other current assets	13,923		8,466
Total current assets	469,684		376,947
PROPERTY AND EQUIPMENT, NET	187,242		158,247
GOODWILL	262,989	88,100	174,849
INTANGIBLE ASSETS, NET	134,306		49,773
DEFERRED TAX ASSETS, NET NON-CURRENT	0		0
INVESTMENT IN SUBSIDIARIES	0		0
INTERCOMPANY RECEIVABLES	0		0
OTHER	18,588		12,377
TOTAL NON-CURRENT ASSETS	603,125		395,246
TOTAL ASSETS	1,072,809		772,193
CURRENT LIABILITIES:
Accounts payable	64,166		36,823
Current portion of debt	6,250		74
Billings in excess of costs and estimated earnings	11,386		1,522
Accrued insurance claims	26,313		25,218
Deferred tax liabilities	0		0
Other accrued liabilities	69,959		50,926
Total current liabilities	178,074		114,563
Long-term debt	420,033		187,500
ACCRUED INSURANCE CLAIMS	23,693		23,591
DEFERRED TAX LIABILITIES, NET NON-CURRENT	48,100		49,537
INTERCOMPANY PAYABLES	0		0
OTHER LIABILITIES	4,537		4,071
Total liabilities	674,437		379,262
Total stockholders' equity	398,372		392,931
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY	1,072,809		772,193
Parent
CURRENT ASSETS:
Cash and equivalents	0		0	0	0
Accounts receivable, net	0		0
Costs and estimated earnings in excess of billings	0		0
Inventories	0		0
Deferred tax assets, net	2,604		2,390
Income taxes receivable	6,925		4,884
Other current assets	7,258		2,211
Total current assets	16,787		9,485
PROPERTY AND EQUIPMENT, NET	12,850		9,671
GOODWILL	0		0
INTANGIBLE ASSETS, NET	0		0
DEFERRED TAX ASSETS, NET NON-CURRENT	0		0
INVESTMENT IN SUBSIDIARIES	747,775		734,451
INTERCOMPANY RECEIVABLES	0		0
OTHER	9,232		6,075
TOTAL NON-CURRENT ASSETS	769,857		750,197
TOTAL ASSETS	786,644		759,682
CURRENT LIABILITIES:
Accounts payable	3,715		2,785
Current portion of debt	6,250		0
Billings in excess of costs and estimated earnings	0		0
Accrued insurance claims	587		588
Deferred tax liabilities	0		0
Other accrued liabilities	5,471		5,054
Total current liabilities	16,023		8,427
Long-term debt	138,750		0
ACCRUED INSURANCE CLAIMS	719		708
DEFERRED TAX LIABILITIES, NET NON-CURRENT	908		1,020
INTERCOMPANY PAYABLES	228,940		353,713
OTHER LIABILITIES	2,932		2,883
Total liabilities	388,272		366,751
Total stockholders' equity	398,372		392,931
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY	786,644		759,682
Issuer
CURRENT ASSETS:
Cash and equivalents	0		0	0	0
Accounts receivable, net	0		0
Costs and estimated earnings in excess of billings	0		0
Inventories	0		0
Deferred tax assets, net	0		0
Income taxes receivable	0		0
Other current assets	39		10
Total current assets	39		10
PROPERTY AND EQUIPMENT, NET	0		0
GOODWILL	0		0
INTANGIBLE ASSETS, NET	0		0
DEFERRED TAX ASSETS, NET NON-CURRENT	65		65
INVESTMENT IN SUBSIDIARIES	1,441,693		1,425,451
INTERCOMPANY RECEIVABLES	0		0
OTHER	6,503		4,338
TOTAL NON-CURRENT ASSETS	1,448,261		1,429,854
TOTAL ASSETS	1,448,300		1,429,864
CURRENT LIABILITIES:
Accounts payable	0		0
Current portion of debt	0		0
Billings in excess of costs and estimated earnings	0		0
Accrued insurance claims	0		0
Deferred tax liabilities	248		249
Other accrued liabilities	1,055		565
Total current liabilities	1,303		814
Long-term debt	281,283		187,500
ACCRUED INSURANCE CLAIMS	0		0
DEFERRED TAX LIABILITIES, NET NON-CURRENT	0		0
INTERCOMPANY PAYABLES	417,939		507,099
OTHER LIABILITIES	0		0
Total liabilities	700,525		695,413
Total stockholders' equity	747,775		734,451
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY	1,448,300		1,429,864
Subsidiary Guarantors
CURRENT ASSETS:
Cash and equivalents	21,528		51,563	85,313	44,608
Accounts receivable, net	226,569		140,426
Costs and estimated earnings in excess of billings	147,537		125,869
Inventories	34,909		26,274
Deferred tax assets, net	13,161		13,566
Income taxes receivable	0		0
Other current assets	6,038		5,458
Total current assets	449,742		363,156
PROPERTY AND EQUIPMENT, NET	158,945		133,145
GOODWILL	262,989		174,849
INTANGIBLE ASSETS, NET	134,306		49,773
DEFERRED TAX ASSETS, NET NON-CURRENT	5,531		9,341
INVESTMENT IN SUBSIDIARIES	0		0
INTERCOMPANY RECEIVABLES	650,826		860,758
OTHER	2,698		1,731
TOTAL NON-CURRENT ASSETS	1,215,295		1,229,597
TOTAL ASSETS	1,665,037		1,592,753
CURRENT LIABILITIES:
Accounts payable	58,619		33,441
Current portion of debt	0		74
Billings in excess of costs and estimated earnings	11,386		1,522
Accrued insurance claims	25,625		24,551
Deferred tax liabilities	86		84
Other accrued liabilities	62,647		43,772
Total current liabilities	158,363		103,444
Long-term debt	0		0
ACCRUED INSURANCE CLAIMS	22,873		22,815
DEFERRED TAX LIABILITIES, NET NON-CURRENT	52,355		57,140
INTERCOMPANY PAYABLES	0		0
OTHER LIABILITIES	1,603		1,185
Total liabilities	235,194		184,584
Total stockholders' equity	1,429,843		1,408,169
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY	1,665,037		1,592,753
Non-Guarantor Subsidiaries
CURRENT ASSETS:
Cash and equivalents	1,062		1,018	882	158
Accounts receivable, net	844		1,362
Costs and estimated earnings in excess of billings	965		1,452
Inventories	0		0
Deferred tax assets, net	69		80
Income taxes receivable	0		0
Other current assets	588		787
Total current assets	3,528		4,699
PROPERTY AND EQUIPMENT, NET	15,447		15,431
GOODWILL	0		0
INTANGIBLE ASSETS, NET	0		0
DEFERRED TAX ASSETS, NET NON-CURRENT	815		1,085
INVESTMENT IN SUBSIDIARIES	0		0
INTERCOMPANY RECEIVABLES	0		54
OTHER	155		233
TOTAL NON-CURRENT ASSETS	16,417		16,803
TOTAL ASSETS	19,945		21,502
CURRENT LIABILITIES:
Accounts payable	1,832		597
Current portion of debt	0		0
Billings in excess of costs and estimated earnings	0		0
Accrued insurance claims	101		79
Deferred tax liabilities	78		70
Other accrued liabilities	786		1,535
Total current liabilities	2,797		2,281
Long-term debt	0		0
ACCRUED INSURANCE CLAIMS	101		68
DEFERRED TAX LIABILITIES, NET NON-CURRENT	1,248		1,868
INTERCOMPANY PAYABLES	3,947		0
OTHER LIABILITIES	2		3
Total liabilities	8,095		4,220
Total stockholders' equity	11,850		17,282
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY	19,945		21,502
Eliminations and Reclassifications
CURRENT ASSETS:
Cash and equivalents	0		0	0
Accounts receivable, net	0		0
Costs and estimated earnings in excess of billings	0		0
Inventories	0		0
Deferred tax assets, net	(412)		(403)
Income taxes receivable	0		0
Other current assets	0		0
Total current assets	(412)		(403)
PROPERTY AND EQUIPMENT, NET	0		0
GOODWILL	0		0
INTANGIBLE ASSETS, NET	0		0
DEFERRED TAX ASSETS, NET NON-CURRENT	(6,411)		(10,491)
INVESTMENT IN SUBSIDIARIES	(2,189,468)		(2,159,902)
INTERCOMPANY RECEIVABLES	(650,826)		(860,812)
OTHER	0		0
TOTAL NON-CURRENT ASSETS	(2,846,705)		(3,031,205)
TOTAL ASSETS	(2,847,117)		(3,031,608)
CURRENT LIABILITIES:
Accounts payable	0		0
Current portion of debt	0		0
Billings in excess of costs and estimated earnings	0		0
Accrued insurance claims	0		0
Deferred tax liabilities	(412)		(403)
Other accrued liabilities	0		0
Total current liabilities	(412)		(403)
Long-term debt	0		0
ACCRUED INSURANCE CLAIMS	0		0
DEFERRED TAX LIABILITIES, NET NON-CURRENT	(6,411)		(10,491)
INTERCOMPANY PAYABLES	(650,826)		(860,812)
OTHER LIABILITIES	0		0
Total liabilities	(657,649)		(871,706)
Total stockholders' equity	(2,189,468)		(2,159,902)
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY	$ (2,847,117)		$ (3,031,608)