Supplemental Consolidating Financial Statements Balance Sheet (Details) (USD $) In Thousands, unless otherwise specified	Oct. 27, 2012	Jul. 28, 2012	Oct. 29, 2011	Jul. 30, 2011
CURRENT ASSETS:
Cash and equivalents	$ 54,726	$ 52,581	$ 51,312	$ 44,766
Accounts receivable, net	153,794	141,788
Costs and estimated earnings in excess of billings	118,409	127,321
Inventories	25,142	26,274
Deferred tax assets, net	16,074	15,633
Income taxes receivable	741	4,884
Other current assets	12,822	8,466
Total current assets	381,708	376,947
PROPERTY AND EQUIPMENT, NET	154,701	158,247
GOODWILL	174,849	174,849
INTANGIBLE ASSETS, NET	48,182	49,773
DEFERRED TAX ASSETS, NET NON-CURRENT	0	0
INVESTMENT IN SUBSIDIARIES	0	0
INTERCOMPANY RECEIVABLES	0	0
OTHER	12,093	12,377
TOTAL NON-CURRENT ASSETS	389,825	395,246
TOTAL ASSETS	771,533	772,193
CURRENT LIABILITIES:
Accounts payable	38,485	36,823
Current portion of debt	55	74
Billings in excess of costs and estimated earnings	1,447	1,522
Accrued insurance claims	24,244	25,218
Deferred tax liabilities	0	0
Other accrued liabilities	47,642	50,926
Income taxes payable	4,567	0
Total current liabilities	116,440	114,563
LONG-TERM DEBT	187,500	187,500
ACCRUED INSURANCE CLAIMS	22,847	23,591
DEFERRED TAX LIABILITIES, NET NON-CURRENT	48,792	49,537
INTERCOMPANY PAYABLES	0	0
OTHER LIABILITIES	3,959	4,071
Total liabilities	379,538	379,262
Total stockholders' equity	391,995	392,931
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY	771,533	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	2,423	2,390
Income taxes receivable	741	4,884
Other current assets	6,878	2,211
Total current assets	10,042	9,485
PROPERTY AND EQUIPMENT, NET	10,578	9,671
GOODWILL	0	0
INTANGIBLE ASSETS, NET	0	0
DEFERRED TAX ASSETS, NET NON-CURRENT	0	0
INVESTMENT IN SUBSIDIARIES	746,311	734,451
INTERCOMPANY RECEIVABLES	0	0
OTHER	5,753	6,075
TOTAL NON-CURRENT ASSETS	762,642	750,197
TOTAL ASSETS	772,684	759,682
CURRENT LIABILITIES:
Accounts payable	3,552	2,785
Current portion of debt	0	0
Billings in excess of costs and estimated earnings	0	0
Accrued insurance claims	588	588
Deferred tax liabilities	0	0
Other accrued liabilities	3,873	5,054
Income taxes payable	4,567
Total current liabilities	12,580	8,427
LONG-TERM DEBT	0	0
ACCRUED INSURANCE CLAIMS	715	708
DEFERRED TAX LIABILITIES, NET NON-CURRENT	811	1,020
INTERCOMPANY PAYABLES	363,676	353,713
OTHER LIABILITIES	2,907	2,883
Total liabilities	380,689	366,751
Total stockholders' equity	391,995	392,931
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY	772,684	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	54	10
Total current assets	54	10
PROPERTY AND EQUIPMENT, NET	0	0
GOODWILL	0	0
INTANGIBLE ASSETS, NET	0	0
DEFERRED TAX ASSETS, NET NON-CURRENT	64	65
INVESTMENT IN SUBSIDIARIES	1,439,481	1,425,451
INTERCOMPANY RECEIVABLES	0	0
OTHER	4,229	4,338
TOTAL NON-CURRENT ASSETS	1,443,774	1,429,854
TOTAL ASSETS	1,443,828	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	249	249
Other accrued liabilities	3,929	565
Income taxes payable	0
Total current liabilities	4,178	814
LONG-TERM DEBT	187,500	187,500
ACCRUED INSURANCE CLAIMS	0	0
DEFERRED TAX LIABILITIES, NET NON-CURRENT	0	0
INTERCOMPANY PAYABLES	505,839	507,099
OTHER LIABILITIES	0	0
Total liabilities	697,517	695,413
Total stockholders' equity	746,311	734,451
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY	1,443,828	1,429,864
Subsidiary Guarantors
CURRENT ASSETS:
Cash and equivalents	54,096	51,563	51,262	44,608
Accounts receivable, net	151,840	140,426
Costs and estimated earnings in excess of billings	116,301	125,869
Inventories	25,142	26,274
Deferred tax assets, net	13,962	13,566
Income taxes receivable	0	0
Other current assets	5,080	5,458
Total current assets	366,421	363,156
PROPERTY AND EQUIPMENT, NET	128,563	133,145
GOODWILL	174,849	174,849
INTANGIBLE ASSETS, NET	48,182	49,773
DEFERRED TAX ASSETS, NET NON-CURRENT	4,314	9,341
INVESTMENT IN SUBSIDIARIES	0	0
INTERCOMPANY RECEIVABLES	871,537	860,758
OTHER	1,917	1,731
TOTAL NON-CURRENT ASSETS	1,229,362	1,229,597
TOTAL ASSETS	1,595,783	1,592,753
CURRENT LIABILITIES:
Accounts payable	33,709	33,441
Current portion of debt	55	74
Billings in excess of costs and estimated earnings	1,447	1,522
Accrued insurance claims	23,559	24,551
Deferred tax liabilities	82	84
Other accrued liabilities	38,386	43,772
Income taxes payable	0
Total current liabilities	97,238	103,444
LONG-TERM DEBT	0	0
ACCRUED INSURANCE CLAIMS	22,040	22,815
DEFERRED TAX LIABILITIES, NET NON-CURRENT	51,553	57,140
INTERCOMPANY PAYABLES	0	0
OTHER LIABILITIES	1,049	1,185
Total liabilities	171,880	184,584
Total stockholders' equity	1,423,903	1,408,169
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY	1,595,783	1,592,753
Non-Guarantor Subsidiaries
CURRENT ASSETS:
Cash and equivalents	630	1,018	50	158
Accounts receivable, net	1,954	1,362
Costs and estimated earnings in excess of billings	2,108	1,452
Inventories	0	0
Deferred tax assets, net	84	80
Income taxes receivable	0	0
Other current assets	810	787
Total current assets	5,586	4,699
PROPERTY AND EQUIPMENT, NET	15,560	15,431
GOODWILL	0	0
INTANGIBLE ASSETS, NET	0	0
DEFERRED TAX ASSETS, NET NON-CURRENT	651	1,085
INVESTMENT IN SUBSIDIARIES	0	0
INTERCOMPANY RECEIVABLES	0	54
OTHER	194	233
TOTAL NON-CURRENT ASSETS	16,405	16,803
TOTAL ASSETS	21,991	21,502
CURRENT LIABILITIES:
Accounts payable	1,224	597
Current portion of debt	0	0
Billings in excess of costs and estimated earnings	0	0
Accrued insurance claims	97	79
Deferred tax liabilities	64	70
Other accrued liabilities	1,454	1,535
Income taxes payable	0
Total current liabilities	2,839	2,281
LONG-TERM DEBT	0	0
ACCRUED INSURANCE CLAIMS	92	68
DEFERRED TAX LIABILITIES, NET NON-CURRENT	1,457	1,868
INTERCOMPANY PAYABLES	2,022	0
OTHER LIABILITIES	3	3
Total liabilities	6,413	4,220
Total stockholders' equity	15,578	17,282
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY	21,991	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	(395)	(403)
Income taxes receivable	0	0
Other current assets	0	0
Total current assets	(395)	(403)
PROPERTY AND EQUIPMENT, NET	0	0
GOODWILL	0	0
INTANGIBLE ASSETS, NET	0	0
DEFERRED TAX ASSETS, NET NON-CURRENT	(5,029)	(10,491)
INVESTMENT IN SUBSIDIARIES	(2,185,792)	(2,159,902)
INTERCOMPANY RECEIVABLES	(871,537)	(860,812)
OTHER	0	0
TOTAL NON-CURRENT ASSETS	(3,062,358)	(3,031,205)
TOTAL ASSETS	(3,062,753)	(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	(395)	(403)
Other accrued liabilities	0	0
Income taxes payable	0
Total current liabilities	(395)	(403)
LONG-TERM DEBT	0	0
ACCRUED INSURANCE CLAIMS	0	0
DEFERRED TAX LIABILITIES, NET NON-CURRENT	(5,029)	(10,491)
INTERCOMPANY PAYABLES	(871,537)	(860,812)
OTHER LIABILITIES	0	0
Total liabilities	(876,961)	(871,706)
Total stockholders' equity	(2,185,792)	(2,159,902)
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY	$ (3,062,753)	$ (3,031,608)