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Condensed Consolidating Financial Statements - Condensed Consolidating Balance Sheet (Details) - USD ($) | Dec. 31, 2017 | Nov. 30, 2017 | Dec. 25, 2016 | Dec. 27, 2015 | Dec. 28, 2014 | May 31, 2014
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Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |
Principal | $ 300,800,000.0 |  | $ 437,300,000.0 |  |  |
Ownership percentage | 100.00% |  |  |  |  |
Current assets: |  |  |  |  |  |
Cash and cash equivalents | $ 129,600,000 |  | 69,100,000 | $ 28,500,000 | $ 33,500,000 |
Accounts receivable, net | 268,400,000 |  | 229,400,000 |  |  |
Amounts due from affiliated companies | 0 |  | 0 |  |  |
Inventoried costs | 50,400,000 |  | 55,400,000 |  |  |
Other current assets | 22,900,000 |  | 19,200,000 |  |  |
Total current assets | 471,300,000 |  | 373,100,000 |  |  |
Property, plant and equipment, net | 61,200,000 |  | 49,800,000 |  |  |
Goodwill | 461,200,000 |  | 485,400,000 |  |  |
Intangible assets, net | 22,000,000 |  | 32,600,000 |  |  |
Investment in subsidiaries | 0 |  | 0 |  |  |
Other assets | 8,300,000 |  | 7,700,000 |  |  |
Total assets | 1,024,000,000 |  | 948,600,000 | 903,300,000 |  |
Current liabilities: |  |  |  |  |  |
Accounts payable | 48,800,000 |  | 52,700,000 |  |  |
Accrued expenses | 47,300,000 |  | 53,600,000 |  |  |
Accrued compensation | 34,800,000 |  | 39,100,000 |  |  |
Billings in excess of costs and earnings on uncompleted contracts | 47,200,000 |  | 41,800,000 |  |  |
Amounts due to affiliated companies | 0 |  | 0 |  |  |
Other current liabilities | 9,700,000 |  | 7,700,000 |  |  |
Current liabilities of discontinued operations | 1,100,000 |  | 1,600,000 |  |  |
Total current liabilities | 188,900,000 |  | 196,500,000 |  |  |
Long-term debt, net of current portion | 293,500,000 |  | 431,000,000 |  |  |
Other long-term liabilities | 26,300,000 |  | 41,000,000 |  |  |
Non-current liabilities of discontinued operations | 3,800,000 |  | 3,700,000 |  |  |
Total liabilities | 512,500,000 |  | 672,200,000 |  |  |
Total stockholders’ equity | 511,500,000 |  | 276,400,000 | $ 254,200,000 | $ 224,300,000 |
Total liabilities and stockholders’ equity | 1,024,000,000 |  | 948,600,000 |  |  |
Eliminations |  |  |  |  |  |
Current assets: |  |  |  |  |  |
Cash and cash equivalents | 0 |  | 0 |  |  |
Accounts receivable, net | 0 |  | 0 |  |  |
Amounts due from affiliated companies | (238,100,000) |  | (204,600,000) |  |  |
Inventoried costs | 0 |  | 0 |  |  |
Other current assets | 0 |  | 0 |  |  |
Total current assets | (238,100,000) |  | (204,600,000) |  |  |
Property, plant and equipment, net | 0 |  | 0 |  |  |
Goodwill | 0 |  | 0 |  |  |
Intangible assets, net | 0 |  | 0 |  |  |
Investment in subsidiaries | (541,100,000) |  | (525,500,000) |  |  |
Other assets | 0 |  | 0 |  |  |
Total assets | (779,200,000) |  | (730,100,000) |  |  |
Current liabilities: |  |  |  |  |  |
Accounts payable | 0 |  | 0 |  |  |
Accrued expenses | 0 |  | 0 |  |  |
Accrued compensation | 0 |  | 0 |  |  |
Billings in excess of costs and earnings on uncompleted contracts | 0 |  | 0 |  |  |
Amounts due to affiliated companies | (238,100,000) |  | (204,600,000) |  |  |
Other current liabilities | 0 |  | 0 |  |  |
Current liabilities of discontinued operations | 0 |  | 0 |  |  |
Total current liabilities | (238,100,000) |  | (204,600,000) |  |  |
Long-term debt, net of current portion | 0 |  | 0 |  |  |
Other long-term liabilities | 0 |  | 0 |  |  |
Non-current liabilities of discontinued operations | 0 |  | 0 |  |  |
Total liabilities | (238,100,000) |  | (204,600,000) |  |  |
Total stockholders’ equity | (541,100,000) |  | (525,500,000) |  |  |
Total liabilities and stockholders’ equity | (779,200,000) |  | (730,100,000) |  |  |
Parent Company |  |  |  |  |  |
Current assets: |  |  |  |  |  |
Cash and cash equivalents | 121,100,000 |  | 67,200,000 |  |  |
Accounts receivable, net | 0 |  | 0 |  |  |
Amounts due from affiliated companies | 238,100,000 |  | 204,600,000 |  |  |
Inventoried costs | 0 |  | 0 |  |  |
Other current assets | 3,900,000 |  | 6,300,000 |  |  |
Total current assets | 363,100,000 |  | 278,100,000 |  |  |
Property, plant and equipment, net | 1,900,000 |  | 1,600,000 |  |  |
Goodwill | 0 |  | 0 |  |  |
Intangible assets, net | 0 |  | 0 |  |  |
Investment in subsidiaries | 471,100,000 |  | 458,000,000 |  |  |
Other assets | 800,000 |  | 400,000 |  |  |
Total assets | 836,900,000 |  | 738,100,000 |  |  |
Current liabilities: |  |  |  |  |  |
Accounts payable | 2,300,000 |  | 4,500,000 |  |  |
Accrued expenses | 5,700,000 |  | 5,600,000 |  |  |
Accrued compensation | 5,600,000 |  | 4,000,000 |  |  |
Billings in excess of costs and earnings on uncompleted contracts | 0 |  | 0 |  |  |
Amounts due to affiliated companies | 0 |  | 0 |  |  |
Other current liabilities | 1,400,000 |  | 1,400,000 |  |  |
Current liabilities of discontinued operations | 1,000,000 |  | 1,500,000 |  |  |
Total current liabilities | 16,000,000 |  | 17,000,000 |  |  |
Long-term debt, net of current portion | 293,500,000 |  | 430,200,000 |  |  |
Other long-term liabilities | 12,100,000 |  | 10,800,000 |  |  |
Non-current liabilities of discontinued operations | 3,800,000 |  | 3,700,000 |  |  |
Total liabilities | 325,400,000 |  | 461,700,000 |  |  |
Total stockholders’ equity | 511,500,000 |  | 276,400,000 |  |  |
Total liabilities and stockholders’ equity | 836,900,000 |  | 738,100,000 |  |  |
Subsidiary Guarantors on a Combined Basis |  |  |  |  |  |
Current assets: |  |  |  |  |  |
Cash and cash equivalents | (2,200,000) |  | (3,300,000) |  |  |
Accounts receivable, net | 239,900,000 |  | 197,900,000 |  |  |
Amounts due from affiliated companies | 0 |  | 0 |  |  |
Inventoried costs | 32,200,000 |  | 37,200,000 |  |  |
Other current assets | 15,600,000 |  | 11,600,000 |  |  |
Total current assets | 285,500,000 |  | 243,400,000 |  |  |
Property, plant and equipment, net | 52,500,000 |  | 41,700,000 |  |  |
Goodwill | 418,300,000 |  | 442,500,000 |  |  |
Intangible assets, net | 15,800,000 |  | 24,500,000 |  |  |
Investment in subsidiaries | 70,000,000 |  | 67,500,000 |  |  |
Other assets | 7,500,000 |  | 7,300,000 |  |  |
Total assets | 849,600,000 |  | 826,900,000 |  |  |
Current liabilities: |  |  |  |  |  |
Accounts payable | 42,000,000 |  | 43,700,000 |  |  |
Accrued expenses | 38,300,000 |  | 44,500,000 |  |  |
Accrued compensation | 25,300,000 |  | 31,200,000 |  |  |
Billings in excess of costs and earnings on uncompleted contracts | 42,600,000 |  | 38,900,000 |  |  |
Amounts due to affiliated companies | 206,400,000 |  | 174,600,000 |  |  |
Other current liabilities | 4,600,000 |  | 4,100,000 |  |  |
Current liabilities of discontinued operations | 0 |  | 0 |  |  |
Total current liabilities | 359,200,000 |  | 337,000,000 |  |  |
Long-term debt, net of current portion | 0 |  | 0 |  |  |
Other long-term liabilities | 7,300,000 |  | 19,900,000 |  |  |
Non-current liabilities of discontinued operations | 0 |  | 0 |  |  |
Total liabilities | 366,500,000 |  | 356,900,000 |  |  |
Total stockholders’ equity | 483,100,000 |  | 470,000,000 |  |  |
Total liabilities and stockholders’ equity | 849,600,000 |  | 826,900,000 |  |  |
Non-Guarantors on a Combined Basis |  |  |  |  |  |
Current assets: |  |  |  |  |  |
Cash and cash equivalents | 10,700,000 |  | 5,200,000 |  |  |
Accounts receivable, net | 28,500,000 |  | 31,500,000 |  |  |
Amounts due from affiliated companies | 0 |  | 0 |  |  |
Inventoried costs | 18,200,000 |  | 18,200,000 |  |  |
Other current assets | 3,400,000 |  | 1,300,000 |  |  |
Total current assets | 60,800,000 |  | 56,200,000 |  |  |
Property, plant and equipment, net | 6,800,000 |  | 6,500,000 |  |  |
Goodwill | 42,900,000 |  | 42,900,000 |  |  |
Intangible assets, net | 6,200,000 |  | 8,100,000 |  |  |
Investment in subsidiaries | 0 |  | 0 |  |  |
Other assets | 0 |  | 0 |  |  |
Total assets | 116,700,000 |  | 113,700,000 |  |  |
Current liabilities: |  |  |  |  |  |
Accounts payable | 4,500,000 |  | 4,500,000 |  |  |
Accrued expenses | 3,300,000 |  | 3,500,000 |  |  |
Accrued compensation | 3,900,000 |  | 3,900,000 |  |  |
Billings in excess of costs and earnings on uncompleted contracts | 4,600,000 |  | 2,900,000 |  |  |
Amounts due to affiliated companies | 31,700,000 |  | 30,000,000 |  |  |
Other current liabilities | 3,700,000 |  | 2,200,000 |  |  |
Current liabilities of discontinued operations | 100,000 |  | 100,000 |  |  |
Total current liabilities | 51,800,000 |  | 47,100,000 |  |  |
Long-term debt, net of current portion | 0 |  | 800,000 |  |  |
Other long-term liabilities | 6,900,000 |  | 10,300,000 |  |  |
Non-current liabilities of discontinued operations | 0 |  | 0 |  |  |
Total liabilities | 58,700,000 |  | 58,200,000 |  |  |
Total stockholders’ equity | 58,000,000 |  | 55,500,000 |  |  |
Total liabilities and stockholders’ equity | 116,700,000 |  | $ 113,700,000 |  |  |
Senior notes | 7% Senior Notes due 2019 |  |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |
Principal | $ 300,000,000 |  |  |  |  | $ 625,000,000.0
Stated interest rate | 7.00% |  |  |  |  | 7.00%
Senior notes | 6.5% Notes |  |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |
Principal |  | $ 300,000,000 |  |  |  |
Stated interest rate | 6.50% | 6.50% |  |  |  |

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