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Supplemental Consolidating Financial Statements - Balance Sheet (Details) (USD $) In Thousands, unless otherwise specified | Oct. 25, 2014 | Jul. 26, 2014 | Oct. 26, 2013 | Jul. 27, 2013
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CURRENT ASSETS: |  |  |  |
Cash and equivalents | $ 16,459 | $ 20,672 | $ 14,394 | $ 18,607
Accounts receivable, net | 296,832 | 272,741 |  |
Costs and estimated earnings in excess of billings | 256,951 | 230,569 |  |
Inventories | 47,003 | 49,095 |  |
Deferred tax assets, net | 21,022 | 19,932 |  |
Other current assets | 14,467 | 12,727 |  |
Total current assets | 652,734 | 605,736 |  |
PROPERTY AND EQUIPMENT, NET | 206,139 | 205,413 |  |
GOODWILL | 269,465 | 269,088 |  |
INTANGIBLE ASSETS, NET | 117,824 | 116,116 |  |
DEFERRED TAX ASSETS, NET NON-CURRENT | 0 | 0 |  |
INVESTMENT IN SUBSIDIARIES | 0 | 0 |  |
INTERCOMPANY RECEIVABLES | 0 | 0 |  |
OTHER | 15,995 | 16,001 |  |
TOTAL NON-CURRENT ASSETS | 609,423 | 606,618 |  |
TOTAL ASSETS | 1,262,157 | 1,212,354 |  |
CURRENT LIABILITIES: |  |  |  |
Accounts payable | 66,422 | 63,318 |  |
Current portion of debt | 11,719 | 10,938 |  |
Billings in excess of costs and estimated earnings | 14,027 | 13,882 |  |
Accrued insurance claims | 33,525 | 32,260 |  |
Deferred tax liabilities | 0 | 0 |  |
Other accrued liabilities | 86,905 | 76,134 |  |
Total current liabilities | 212,598 | 196,532 |  |
Long-term debt | 455,640 | 446,863 |  |
ACCRUED INSURANCE CLAIMS | 36,189 | 33,782 |  |
DEFERRED TAX LIABILITIES, NET NON-CURRENT | 43,018 | 45,361 |  |
INTERCOMPANY PAYABLES | 0 | 0 |  |
OTHER LIABILITIES | 5,211 | 4,882 |  |
Total liabilities | 752,656 | 727,420 |  |
Total stockholders' equity | 509,501 | 484,934 |  |
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY | 1,262,157 | 1,212,354 |  |
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 | 4,001 | 3,822 |  |
Other current assets | 7,434 | 4,956 |  |
Total current assets | 11,435 | 8,778 |  |
PROPERTY AND EQUIPMENT, NET | 17,743 | 18,108 |  |
GOODWILL | 0 | 0 |  |
INTANGIBLE ASSETS, NET | 0 | 0 |  |
DEFERRED TAX ASSETS, NET NON-CURRENT | 403 | 182 |  |
INVESTMENT IN SUBSIDIARIES | 830,423 | 809,617 |  |
INTERCOMPANY RECEIVABLES | 0 | 0 |  |
OTHER | 7,967 | 7,748 |  |
TOTAL NON-CURRENT ASSETS | 856,536 | 835,655 |  |
TOTAL ASSETS | 867,971 | 844,433 |  |
CURRENT LIABILITIES: |  |  |  |
Accounts payable | 1,159 | 3,083 |  |
Current portion of debt | 11,719 | 10,938 |  |
Billings in excess of costs and estimated earnings | 0 | 0 |  |
Accrued insurance claims | 565 | 612 |  |
Deferred tax liabilities | 0 | 0 |  |
Other accrued liabilities | 20,437 | 12,668 |  |
Total current liabilities | 33,880 | 27,301 |  |
Long-term debt | 175,000 | 166,125 |  |
ACCRUED INSURANCE CLAIMS | 707 | 778 |  |
DEFERRED TAX LIABILITIES, NET NON-CURRENT | 0 | 0 |  |
INTERCOMPANY PAYABLES | 145,716 | 162,127 |  |
OTHER LIABILITIES | 3,167 | 3,168 |  |
Total liabilities | 358,470 | 359,499 |  |
Total stockholders' equity | 509,501 | 484,934 |  |
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY | 867,971 | 844,433 |  |
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 |  |
Other current assets | 2 | 16 |  |
Total current assets | 2 | 16 |  |
PROPERTY AND EQUIPMENT, NET | 0 | 0 |  |
GOODWILL | 0 | 0 |  |
INTANGIBLE ASSETS, NET | 0 | 0 |  |
DEFERRED TAX ASSETS, NET NON-CURRENT | 0 | 0 |  |
INVESTMENT IN SUBSIDIARIES | 1,565,469 | 1,540,338 |  |
INTERCOMPANY RECEIVABLES | 0 | 0 |  |
OTHER | 5,465 | 5,636 |  |
TOTAL NON-CURRENT ASSETS | 1,570,934 | 1,545,974 |  |
TOTAL ASSETS | 1,570,936 | 1,545,990 |  |
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 | 80 | 80 |  |
Other accrued liabilities | 5,492 | 566 |  |
Total current liabilities | 5,572 | 646 |  |
Long-term debt | 280,640 | 280,738 |  |
ACCRUED INSURANCE CLAIMS | 0 | 0 |  |
DEFERRED TAX LIABILITIES, NET NON-CURRENT | 432 | 432 |  |
INTERCOMPANY PAYABLES | 453,869 | 454,557 |  |
OTHER LIABILITIES | 0 | 0 |  |
Total liabilities | 740,513 | 736,373 |  |
Total stockholders' equity | 830,423 | 809,617 |  |
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY | 1,570,936 | 1,545,990 |  |
Subsidiary Guarantors |  |  |  |
CURRENT ASSETS: |  |  |  |
Cash and equivalents | 15,801 | 19,739 | 13,631 | 18,166
Accounts receivable, net | 293,310 | 269,760 |  |
Costs and estimated earnings in excess of billings | 255,062 | 228,541 |  |
Inventories | 47,003 | 49,095 |  |
Deferred tax assets, net | 17,017 | 16,193 |  |
Other current assets | 6,605 | 7,237 |  |
Total current assets | 634,798 | 590,565 |  |
PROPERTY AND EQUIPMENT, NET | 170,707 | 171,158 |  |
GOODWILL | 269,465 | 269,088 |  |
INTANGIBLE ASSETS, NET | 117,226 | 115,483 |  |
DEFERRED TAX ASSETS, NET NON-CURRENT | 4,294 | 3,884 |  |
INVESTMENT IN SUBSIDIARIES | 1,681 | 1,621 |  |
INTERCOMPANY RECEIVABLES | 612,828 | 628,443 |  |
OTHER | 2,420 | 2,466 |  |
TOTAL NON-CURRENT ASSETS | 1,178,621 | 1,192,143 |  |
TOTAL ASSETS | 1,813,419 | 1,782,708 |  |
CURRENT LIABILITIES: |  |  |  |
Accounts payable | 63,901 | 58,970 |  |
Current portion of debt | 0 | 0 |  |
Billings in excess of costs and estimated earnings | 14,027 | 13,882 |  |
Accrued insurance claims | 32,900 | 31,599 |  |
Deferred tax liabilities | 64 | 66 |  |
Other accrued liabilities | 58,909 | 61,284 |  |
Total current liabilities | 169,801 | 165,801 |  |
Long-term debt | 0 | 0 |  |
ACCRUED INSURANCE CLAIMS | 35,424 | 32,959 |  |
DEFERRED TAX LIABILITIES, NET NON-CURRENT | 46,865 | 48,593 |  |
INTERCOMPANY PAYABLES | 0 | 0 |  |
OTHER LIABILITIES | 2,039 | 1,711 |  |
Total liabilities | 254,129 | 249,064 |  |
Total stockholders' equity | 1,559,290 | 1,533,644 |  |
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY | 1,813,419 | 1,782,708 |  |
Non-Guarantor Subsidiaries |  |  |  |
CURRENT ASSETS: |  |  |  |
Cash and equivalents | 658 | 933 | 763 | 441
Accounts receivable, net | 3,522 | 2,981 |  |
Costs and estimated earnings in excess of billings | 1,889 | 2,028 |  |
Inventories | 0 | 0 |  |
Deferred tax assets, net | 177 | 87 |  |
Other current assets | 426 | 518 |  |
Total current assets | 6,672 | 6,547 |  |
PROPERTY AND EQUIPMENT, NET | 17,689 | 16,147 |  |
GOODWILL | 0 | 0 |  |
INTANGIBLE ASSETS, NET | 598 | 633 |  |
DEFERRED TAX ASSETS, NET NON-CURRENT | 35 | 15 |  |
INVESTMENT IN SUBSIDIARIES | 0 | 0 |  |
INTERCOMPANY RECEIVABLES | 0 | 0 |  |
OTHER | 143 | 151 |  |
TOTAL NON-CURRENT ASSETS | 18,465 | 16,946 |  |
TOTAL ASSETS | 25,137 | 23,493 |  |
CURRENT LIABILITIES: |  |  |  |
Accounts payable | 1,362 | 1,265 |  |
Current portion of debt | 0 | 0 |  |
Billings in excess of costs and estimated earnings | 0 | 0 |  |
Accrued insurance claims | 60 | 49 |  |
Deferred tax liabilities | 29 | 24 |  |
Other accrued liabilities | 2,067 | 1,616 |  |
Total current liabilities | 3,518 | 2,954 |  |
Long-term debt | 0 | 0 |  |
ACCRUED INSURANCE CLAIMS | 58 | 45 |  |
DEFERRED TAX LIABILITIES, NET NON-CURRENT | 453 | 417 |  |
INTERCOMPANY PAYABLES | 13,243 | 11,759 |  |
OTHER LIABILITIES | 5 | 3 |  |
Total liabilities | 17,277 | 15,178 |  |
Total stockholders' equity | 7,860 | 8,315 |  |
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY | 25,137 | 23,493 |  |
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 | (173) | (170) |  |
Other current assets | 0 | 0 |  |
Total current assets | (173) | (170) |  |
PROPERTY AND EQUIPMENT, NET | 0 | 0 |  |
GOODWILL | 0 | 0 |  |
INTANGIBLE ASSETS, NET | 0 | 0 |  |
DEFERRED TAX ASSETS, NET NON-CURRENT | (4,732) | (4,081) |  |
INVESTMENT IN SUBSIDIARIES | (2,397,573) | (2,351,576) |  |
INTERCOMPANY RECEIVABLES | (612,828) | (628,443) |  |
OTHER | 0 | 0 |  |
TOTAL NON-CURRENT ASSETS | (3,015,133) | (2,984,100) |  |
TOTAL ASSETS | (3,015,306) | (2,984,270) |  |
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 | (173) | (170) |  |
Other accrued liabilities | 0 | 0 |  |
Total current liabilities | (173) | (170) |  |
Long-term debt | 0 | 0 |  |
ACCRUED INSURANCE CLAIMS | 0 | 0 |  |
DEFERRED TAX LIABILITIES, NET NON-CURRENT | (4,732) | (4,081) |  |
INTERCOMPANY PAYABLES | (612,828) | (628,443) |  |
OTHER LIABILITIES | 0 | 0 |  |
Total liabilities | (617,733) | (632,694) |  |
Total stockholders' equity | (2,397,573) | (2,351,576) |  |
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY | $ (3,015,306) | $ (2,984,270) |  |

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