Supplemental Consolidating Financial Statements - Balance Sheet (Details) (USD $) In Thousands, unless otherwise specified	Jul. 27, 2013	Dec. 03, 2012	Jul. 28, 2012	Jul. 30, 2011	Jul. 31, 2010
CURRENT ASSETS:
Cash and equivalents	$ 18,607		$ 52,581	$ 44,766	$ 103,320
Accounts receivable, net	252,202		141,788
Costs and estimated earnings in excess of billings	204,349		127,321
Inventories	35,999		26,274
Deferred tax assets, net	16,853		15,633
Income taxes receivable	2,516		4,884
Other current assets	10,608		8,466
Total current assets	541,134		376,947
PROPERTY AND EQUIPMENT, NET	202,703		158,247
GOODWILL	267,810	87,900	174,849	174,849
INTANGIBLE ASSETS, NET	125,275		49,773
DEFERRED TAX ASSETS, NET NON-CURRENT	0		0
INVESTMENT IN SUBSIDIARIES	0		0
INTERCOMPANY RECEIVABLES	0		0
OTHER	17,286		12,377
TOTAL NON-CURRENT ASSETS	613,074		395,246
TOTAL ASSETS	1,154,208		772,193
CURRENT LIABILITIES:
Accounts payable	77,954		36,823
Current portion of debt	7,813		74
Billings in excess of costs and estimated earnings	13,788		1,522
Accrued insurance claims	29,069		25,218
Deferred Tax Liabilities, Net, Current	0		0
Other accrued liabilities	71,191		50,926
Total current liabilities	199,815		114,563
Long-term debt	444,169		187,500
ACCRUED INSURANCE CLAIMS	27,250		23,591
DEFERRED TAX LIABILITIES, NET NON-CURRENT	48,612		49,537
INTERCOMPANY PAYABLES	0		0
OTHER LIABILITIES	6,001		4,071
Total liabilities	725,847		379,262
Total stockholders' equity	428,361		392,931	351,851	394,555
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY	1,154,208		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	2,285		2,390
Income taxes receivable	2,516		4,884
Other current assets	2,563		2,211
Total current assets	7,364		9,485
PROPERTY AND EQUIPMENT, NET	13,779		9,671
GOODWILL	0		0
INTANGIBLE ASSETS, NET	0		0
DEFERRED TAX ASSETS, NET NON-CURRENT	691		0
INVESTMENT IN SUBSIDIARIES	769,639		734,451
INTERCOMPANY RECEIVABLES	0		0
OTHER	8,739		6,075
TOTAL NON-CURRENT ASSETS	792,848		750,197
TOTAL ASSETS	800,212		759,682
CURRENT LIABILITIES:
Accounts payable	2,042		2,785
Current portion of debt	7,813		0
Billings in excess of costs and estimated earnings	0		0
Accrued insurance claims	619		588
Deferred Tax Liabilities, Net, Current	0		0
Other accrued liabilities	9,151		5,054
Total current liabilities	19,625		8,427
Long-term debt	163,062		0
ACCRUED INSURANCE CLAIMS	726		708
DEFERRED TAX LIABILITIES, NET NON-CURRENT	0		1,020
INTERCOMPANY PAYABLES	185,296		353,713
OTHER LIABILITIES	3,142		2,883
Total liabilities	371,851		366,751
Total stockholders' equity	428,361		392,931
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY	800,212		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	10		10
Total current assets	10		10
PROPERTY AND EQUIPMENT, NET	0		0
GOODWILL	0		0
INTANGIBLE ASSETS, NET	0		0
DEFERRED TAX ASSETS, NET NON-CURRENT	0		65
INVESTMENT IN SUBSIDIARIES	1,472,559		1,425,451
INTERCOMPANY RECEIVABLES	0		0
OTHER	6,331		4,338
TOTAL NON-CURRENT ASSETS	1,478,890		1,429,854
TOTAL ASSETS	1,478,900		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, Net, Current	155		249
Other accrued liabilities	1,321		565
Total current liabilities	1,476		814
Long-term debt	281,107		187,500
ACCRUED INSURANCE CLAIMS	0		0
DEFERRED TAX LIABILITIES, NET NON-CURRENT	427		0
INTERCOMPANY PAYABLES	426,251		507,099
OTHER LIABILITIES	0		0
Total liabilities	709,261		695,413
Total stockholders' equity	769,639		734,451
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY	1,478,900		1,429,864
Subsidiary Guarantors
CURRENT ASSETS:
Cash and equivalents	18,166		51,563	44,608	102,858
Accounts receivable, net	249,533		140,426
Costs and estimated earnings in excess of billings	202,651		125,869
Inventories	35,999		26,274
Deferred tax assets, net	15,873		13,566
Income taxes receivable	0		0
Other current assets	7,583		5,458
Total current assets	529,805		363,156
PROPERTY AND EQUIPMENT, NET	173,254		133,145
GOODWILL	267,810		174,849
INTANGIBLE ASSETS, NET	125,275		49,773
DEFERRED TAX ASSETS, NET NON-CURRENT	4,104		9,341
INVESTMENT IN SUBSIDIARIES	0		0
INTERCOMPANY RECEIVABLES	618,524		860,758
OTHER	2,133		1,731
TOTAL NON-CURRENT ASSETS	1,191,100		1,229,597
TOTAL ASSETS	1,720,905		1,592,753
CURRENT LIABILITIES:
Accounts payable	75,012		33,441
Current portion of debt	0		74
Billings in excess of costs and estimated earnings	13,788		1,522
Accrued insurance claims	28,342		24,551
Deferred Tax Liabilities, Net, Current	140		84
Other accrued liabilities	59,374		43,772
Total current liabilities	176,656		103,444
Long-term debt	0		0
ACCRUED INSURANCE CLAIMS	26,426		22,815
DEFERRED TAX LIABILITIES, NET NON-CURRENT	52,436		57,140
INTERCOMPANY PAYABLES	0		0
OTHER LIABILITIES	2,855		1,185
Total liabilities	258,373		184,584
Total stockholders' equity	1,462,532		1,408,169
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY	1,720,905		1,592,753
Non-Guarantor Subsidiaries
CURRENT ASSETS:
Cash and equivalents	441		1,018	158	462
Accounts receivable, net	2,669		1,362
Costs and estimated earnings in excess of billings	1,698		1,452
Inventories	0		0
Deferred tax assets, net	121		80
Income taxes receivable	0		0
Other current assets	452		787
Total current assets	5,381		4,699
PROPERTY AND EQUIPMENT, NET	15,670		15,431
GOODWILL	0		0
INTANGIBLE ASSETS, NET	0		0
DEFERRED TAX ASSETS, NET NON-CURRENT	66		1,085
INVESTMENT IN SUBSIDIARIES	0		0
INTERCOMPANY RECEIVABLES	0		54
OTHER	83		233
TOTAL NON-CURRENT ASSETS	15,819		16,803
TOTAL ASSETS	21,200		21,502
CURRENT LIABILITIES:
Accounts payable	900		597
Current portion of debt	0		0
Billings in excess of costs and estimated earnings	0		0
Accrued insurance claims	108		79
Deferred Tax Liabilities, Net, Current	1,131		70
Other accrued liabilities	1,345		1,535
Total current liabilities	3,484		2,281
Long-term debt	0		0
ACCRUED INSURANCE CLAIMS	98		68
DEFERRED TAX LIABILITIES, NET NON-CURRENT	610		1,868
INTERCOMPANY PAYABLES	6,977		0
OTHER LIABILITIES	4		3
Total liabilities	11,173		4,220
Total stockholders' equity	10,027		17,282
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY	21,200		21,502
Eliminations and Reclassifications
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	(1,426)		(403)
Income taxes receivable	0		0
Other current assets	0		0
Total current assets	(1,426)		(403)
PROPERTY AND EQUIPMENT, NET	0		0
GOODWILL	0		0
INTANGIBLE ASSETS, NET	0		0
DEFERRED TAX ASSETS, NET NON-CURRENT	(4,861)		(10,491)
INVESTMENT IN SUBSIDIARIES	(2,242,198)		(2,159,902)
INTERCOMPANY RECEIVABLES	(618,524)		(860,812)
OTHER	0		0
TOTAL NON-CURRENT ASSETS	(2,865,583)		(3,031,205)
TOTAL ASSETS	(2,867,009)		(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, Net, Current	(1,426)		(403)
Other accrued liabilities	0		0
Total current liabilities	(1,426)		(403)
Long-term debt	0		0
ACCRUED INSURANCE CLAIMS	0		0
DEFERRED TAX LIABILITIES, NET NON-CURRENT	(4,861)		(10,491)
INTERCOMPANY PAYABLES	(618,524)		(860,812)
OTHER LIABILITIES	0		0
Total liabilities	(624,811)		(871,706)
Total stockholders' equity	(2,242,198)		(2,159,902)
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY	$ (2,867,009)		$ (3,031,608)