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Supplemental Consolidating Financial Statements - Balance Sheet (Details) (USD $) In Thousands, unless otherwise specified | Apr. 26, 2014 | Jul. 27, 2013 | Apr. 27, 2013 | Dec. 03, 2012 | Jul. 28, 2012
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CURRENT ASSETS: |  |  |  |  |
Cash and equivalents | $ 18,722 | $ 18,607 | $ 18,247 |  | $ 52,581
Accounts receivable, net | 233,276 | 252,202 |  |  |
Costs and estimated earnings in excess of billings | 198,581 | 204,349 |  |  |
Inventories | 42,512 | 35,999 |  |  |
Deferred tax assets, net | 17,156 | 16,853 |  |  |
Income taxes receivable | 12,287 | 2,516 |  |  |
Other current assets | 18,656 | 10,608 |  |  |
Total current assets | 541,190 | 541,134 |  |  |
PROPERTY AND EQUIPMENT, NET | 205,703 | 202,703 |  |  |
GOODWILL | 267,810 | 267,810 |  | 87,900 |
INTANGIBLE ASSETS, NET | 111,819 | 125,275 |  |  |
DEFERRED TAX ASSETS, NET NON-CURRENT | 0 | 0 |  |  |
INVESTMENT IN SUBSIDIARIES | 0 | 0 |  |  |
INTERCOMPANY RECEIVABLES | 0 | 0 |  |  |
OTHER | 16,254 | 17,286 |  |  |
TOTAL NON-CURRENT ASSETS | 601,586 | 613,074 |  |  |
TOTAL ASSETS | 1,142,776 | 1,154,208 |  |  |
CURRENT LIABILITIES: |  |  |  |  |
Accounts payable | 62,985 | 77,954 |  |  |
Current portion of debt | 10,156 | 7,813 |  |  |
Billings in excess of costs and estimated earnings | 13,401 | 13,788 |  |  |
Accrued insurance claims | 32,567 | 29,069 |  |  |
Deferred Tax Liabilities, Net, Current | 0 | 0 |  |  |
Other accrued liabilities | 69,758 | 71,191 |  |  |
Total current liabilities | 188,867 | 199,815 |  |  |
Long-term debt | 403,082 | 444,169 |  |  |
ACCRUED INSURANCE CLAIMS | 32,027 | 27,250 |  |  |
DEFERRED TAX LIABILITIES, NET NON-CURRENT | 47,915 | 48,612 |  |  |
INTERCOMPANY PAYABLES | 0 | 0 |  |  |
OTHER LIABILITIES | 5,960 | 6,001 |  |  |
Total liabilities | 677,851 | 725,847 |  |  |
Total stockholders' equity | 464,925 | 428,361 |  |  |
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY | 1,142,776 | 1,154,208 |  |  |
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 | 2,993 | 2,285 |  |  |
Income taxes receivable | 12,287 | 2,516 |  |  |
Other current assets | 5,995 | 2,563 |  |  |
Total current assets | 21,275 | 7,364 |  |  |
PROPERTY AND EQUIPMENT, NET | 17,696 | 13,779 |  |  |
GOODWILL | 0 | 0 |  |  |
INTANGIBLE ASSETS, NET | 0 | 0 |  |  |
DEFERRED TAX ASSETS, NET NON-CURRENT | 240 | 691 |  |  |
INVESTMENT IN SUBSIDIARIES | 793,127 | 769,639 |  |  |
INTERCOMPANY RECEIVABLES | 0 | 0 |  |  |
OTHER | 8,165 | 8,739 |  |  |
TOTAL NON-CURRENT ASSETS | 819,228 | 792,848 |  |  |
TOTAL ASSETS | 840,503 | 800,212 |  |  |
CURRENT LIABILITIES: |  |  |  |  |
Accounts payable | 2,953 | 2,042 |  |  |
Current portion of debt | 10,156 | 7,813 |  |  |
Billings in excess of costs and estimated earnings | 0 | 0 |  |  |
Accrued insurance claims | 634 | 619 |  |  |
Deferred Tax Liabilities, Net, Current | 0 | 0 |  |  |
Other accrued liabilities | 7,390 | 9,151 |  |  |
Total current liabilities | 21,133 | 19,625 |  |  |
Long-term debt | 122,250 | 163,062 |  |  |
ACCRUED INSURANCE CLAIMS | 750 | 726 |  |  |
DEFERRED TAX LIABILITIES, NET NON-CURRENT | 0 | 0 |  |  |
INTERCOMPANY PAYABLES | 228,239 | 185,296 |  |  |
OTHER LIABILITIES | 3,206 | 3,142 |  |  |
Total liabilities | 375,578 | 371,851 |  |  |
Total stockholders' equity | 464,925 | 428,361 |  |  |
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY | 840,503 | 800,212 |  |  |
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 | 33 | 10 |  |  |
Total current assets | 33 | 10 |  |  |
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 | 1,518,317 | 1,472,559 |  |  |
INTERCOMPANY RECEIVABLES | 0 | 0 |  |  |
OTHER | 5,800 | 6,331 |  |  |
TOTAL NON-CURRENT ASSETS | 1,524,117 | 1,478,890 |  |  |
TOTAL ASSETS | 1,524,150 | 1,478,900 |  |  |
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 | 155 |  |  |
Other accrued liabilities | 5,525 | 1,321 |  |  |
Total current liabilities | 5,680 | 1,476 |  |  |
Long-term debt | 280,832 | 281,107 |  |  |
ACCRUED INSURANCE CLAIMS | 0 | 0 |  |  |
DEFERRED TAX LIABILITIES, NET NON-CURRENT | 427 | 427 |  |  |
INTERCOMPANY PAYABLES | 444,084 | 426,251 |  |  |
OTHER LIABILITIES | 0 | 0 |  |  |
Total liabilities | 731,023 | 709,261 |  |  |
Total stockholders' equity | 793,127 | 769,639 |  |  |
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY | 1,524,150 | 1,478,900 |  |  |
Subsidiary Guarantors |  |  |  |  |
CURRENT ASSETS: |  |  |  |  |
Cash and equivalents | 18,009 | 18,166 | 17,631 |  | 51,563
Accounts receivable, net | 231,574 | 249,533 |  |  |
Costs and estimated earnings in excess of billings | 197,150 | 202,651 |  |  |
Inventories | 42,512 | 35,999 |  |  |
Deferred tax assets, net | 14,386 | 15,873 |  |  |
Income taxes receivable | 0 | 0 |  |  |
Other current assets | 12,137 | 7,583 |  |  |
Total current assets | 515,768 | 529,805 |  |  |
PROPERTY AND EQUIPMENT, NET | 173,061 | 173,254 |  |  |
GOODWILL | 267,810 | 267,810 |  |  |
INTANGIBLE ASSETS, NET | 111,151 | 125,275 |  |  |
DEFERRED TAX ASSETS, NET NON-CURRENT | 4,042 | 4,104 |  |  |
INVESTMENT IN SUBSIDIARIES | 954 | 0 |  |  |
INTERCOMPANY RECEIVABLES | 680,660 | 618,524 |  |  |
OTHER | 2,114 | 2,133 |  |  |
TOTAL NON-CURRENT ASSETS | 1,239,792 | 1,191,100 |  |  |
TOTAL ASSETS | 1,755,560 | 1,720,905 |  |  |
CURRENT LIABILITIES: |  |  |  |  |
Accounts payable | 59,103 | 75,012 |  |  |
Current portion of debt | 0 | 0 |  |  |
Billings in excess of costs and estimated earnings | 13,401 | 13,788 |  |  |
Accrued insurance claims | 31,865 | 28,342 |  |  |
Deferred Tax Liabilities, Net, Current | 131 | 140 |  |  |
Other accrued liabilities | 55,034 | 59,374 |  |  |
Total current liabilities | 159,534 | 176,656 |  |  |
Long-term debt | 0 | 0 |  |  |
ACCRUED INSURANCE CLAIMS | 31,210 | 26,426 |  |  |
DEFERRED TAX LIABILITIES, NET NON-CURRENT | 51,342 | 52,436 |  |  |
INTERCOMPANY PAYABLES | 0 | 0 |  |  |
OTHER LIABILITIES | 2,753 | 2,855 |  |  |
Total liabilities | 244,839 | 258,373 |  |  |
Total stockholders' equity | 1,510,721 | 1,462,532 |  |  |
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY | 1,755,560 | 1,720,905 |  |  |
Non-Guarantor Subsidiaries |  |  |  |  |
CURRENT ASSETS: |  |  |  |  |
Cash and equivalents | 713 | 441 | 616 |  | 1,018
Accounts receivable, net | 1,702 | 2,669 |  |  |
Costs and estimated earnings in excess of billings | 1,431 | 1,698 |  |  |
Inventories | 0 | 0 |  |  |
Deferred tax assets, net | 91 | 121 |  |  |
Income taxes receivable | 0 | 0 |  |  |
Other current assets | 491 | 452 |  |  |
Total current assets | 4,428 | 5,381 |  |  |
PROPERTY AND EQUIPMENT, NET | 14,946 | 15,670 |  |  |
GOODWILL | 0 | 0 |  |  |
INTANGIBLE ASSETS, NET | 668 | 0 |  |  |
DEFERRED TAX ASSETS, NET NON-CURRENT | 211 | 66 |  |  |
INVESTMENT IN SUBSIDIARIES | 0 | 0 |  |  |
INTERCOMPANY RECEIVABLES | 0 | 0 |  |  |
OTHER | 175 | 83 |  |  |
TOTAL NON-CURRENT ASSETS | 16,000 | 15,819 |  |  |
TOTAL ASSETS | 20,428 | 21,200 |  |  |
CURRENT LIABILITIES: |  |  |  |  |
Accounts payable | 929 | 900 |  |  |
Current portion of debt | 0 | 0 |  |  |
Billings in excess of costs and estimated earnings | 0 | 0 |  |  |
Accrued insurance claims | 68 | 108 |  |  |
Deferred Tax Liabilities, Net, Current | 28 | 1,131 |  |  |
Other accrued liabilities | 1,809 | 1,345 |  |  |
Total current liabilities | 2,834 | 3,484 |  |  |
Long-term debt | 0 | 0 |  |  |
ACCRUED INSURANCE CLAIMS | 67 | 98 |  |  |
DEFERRED TAX LIABILITIES, NET NON-CURRENT | 639 | 610 |  |  |
INTERCOMPANY PAYABLES | 8,337 | 6,977 |  |  |
OTHER LIABILITIES | 1 | 4 |  |  |
Total liabilities | 11,878 | 11,173 |  |  |
Total stockholders' equity | 8,550 | 10,027 |  |  |
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY | 20,428 | 21,200 |  |  |
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 | (314) | (1,426) |  |  |
Income taxes receivable | 0 | 0 |  |  |
Other current assets | 0 | 0 |  |  |
Total current assets | (314) | (1,426) |  |  |
PROPERTY AND EQUIPMENT, NET | 0 | 0 |  |  |
GOODWILL | 0 | 0 |  |  |
INTANGIBLE ASSETS, NET | 0 | 0 |  |  |
DEFERRED TAX ASSETS, NET NON-CURRENT | (4,493) | (4,861) |  |  |
INVESTMENT IN SUBSIDIARIES | (2,312,398) | (2,242,198) |  |  |
INTERCOMPANY RECEIVABLES | (680,660) | (618,524) |  |  |
OTHER | 0 | 0 |  |  |
TOTAL NON-CURRENT ASSETS | (2,997,551) | (2,865,583) |  |  |
TOTAL ASSETS | (2,997,865) | (2,867,009) |  |  |
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 | (314) | (1,426) |  |  |
Other accrued liabilities | 0 | 0 |  |  |
Total current liabilities | (314) | (1,426) |  |  |
Long-term debt | 0 | 0 |  |  |
ACCRUED INSURANCE CLAIMS | 0 | 0 |  |  |
DEFERRED TAX LIABILITIES, NET NON-CURRENT | (4,493) | (4,861) |  |  |
INTERCOMPANY PAYABLES | (680,660) | (618,524) |  |  |
OTHER LIABILITIES | 0 | 0 |  |  |
Total liabilities | (685,467) | (624,811) |  |  |
Total stockholders' equity | (2,312,398) | (2,242,198) |  |  |
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY | $ (2,997,865) | $ (2,867,009) |  |  |

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