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Condensed Consolidating Financial Statements - Balance Sheet (Details) - USD ($) | Apr. 01, 2018 | Dec. 31, 2017 | Mar. 26, 2017 | Dec. 25, 2016 | May 31, 2014
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Condensed Financial Statements, Captions [Line Items] |  |  |  |  |
Principal | $ 300,500,000 | $ 300,800,000 |  |  |
Current assets: |  |  |  |  |
Cash, cash equivalents and restricted cash | 128,200,000 | 130,900,000 | $ 74,100,000 | $ 70,700,000 |
Accounts receivable and unbilled receivables, net | 208,900,000 | 212,300,000 |  |  |
Amounts due from affiliated companies | 0 | 0 |  |  |
Inventoried costs | 48,200,000 | 49,000,000 |  |  |
Other current assets | 19,700,000 | 20,600,000 |  |  |
Current assets of discontinued operations | 52,100,000 | 58,600,000 |  |  |
Total current assets | 457,100,000 | 471,400,000 |  |  |
Property, plant and equipment, net | 61,500,000 | 58,000,000 |  |  |
Goodwill | 425,700,000 | 425,700,000 |  |  |
Intangible assets, net | 20,300,000 | 22,000,000 |  |  |
Investment in subsidiaries | 0 | 0 |  |  |
Other assets | 7,800,000 | 8,100,000 |  |  |
Non-current assets of discontinued operations | 38,800,000 | 38,800,000 |  |  |
Total assets | 1,011,200,000 | 1,024,000,000 |  |  |
Current liabilities: |  |  |  |  |
Accounts payable | 31,300,000 | 34,700,000 |  |  |
Accrued expenses | 40,400,000 | 42,600,000 |  |  |
Accrued compensation | 34,100,000 | 30,200,000 |  |  |
Billings in excess of costs and earnings on uncompleted contracts | 38,200,000 | 42,800,000 |  |  |
Amounts due to affiliated companies | 0 | 0 |  |  |
Other current liabilities | 7,800,000 | 9,400,000 |  |  |
Current liabilities of discontinued operations | 23,200,000 | 29,200,000 |  |  |
Total current liabilities | 175,000,000 | 188,900,000 |  |  |
Long-term debt, net of current portion | 293,600,000 | 293,500,000 |  |  |
Other long-term liabilities | 24,200,000 | 24,100,000 |  |  |
Non-current liabilities of discontinued operations | 5,900,000 | 6,000,000 |  |  |
Total liabilities | 498,700,000 | 512,500,000 |  |  |
Total stockholders’ equity | 512,500,000 | 511,500,000 |  |  |
Total liabilities and stockholders’ equity | 1,011,200,000 | 1,024,000,000 |  |  |
Eliminations |  |  |  |  |
Current assets: |  |  |  |  |
Cash, cash equivalents and restricted cash | 0 | 0 |  |  |
Accounts receivable and unbilled receivables, net | 0 | 0 |  |  |
Amounts due from affiliated companies | (240,300,000) | (238,100,000) |  |  |
Inventoried costs | 0 | 0 |  |  |
Other current assets | 0 | 0 |  |  |
Current assets of discontinued operations | 0 | 0 |  |  |
Total current assets | (240,300,000) | (238,100,000) |  |  |
Property, plant and equipment, net | 0 | 0 |  |  |
Goodwill | 0 | 0 |  |  |
Intangible assets, net | 0 | 0 |  |  |
Investment in subsidiaries | (548,100,000) | (541,100,000) |  |  |
Other assets | 0 | 0 |  |  |
Non-current assets of discontinued operations | 0 | 0 |  |  |
Total assets | (788,400,000) | (779,200,000) |  |  |
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 | (240,300,000) | (238,100,000) |  |  |
Other current liabilities | 0 | 0 |  |  |
Current liabilities of discontinued operations | 0 | 0 |  |  |
Total current liabilities | (240,300,000) | (238,100,000) |  |  |
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 | (240,300,000) | (238,100,000) |  |  |
Total stockholders’ equity | (548,100,000) | (541,100,000) |  |  |
Total liabilities and stockholders’ equity | $ (788,400,000) | (779,200,000) |  |  |
Subsidiaries |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |
Ownership percentage | 100.00% |  |  |  |
Parent Company |  |  |  |  |
Current assets: |  |  |  |  |
Cash, cash equivalents and restricted cash | $ 118,200,000 | 121,300,000 |  |  |
Accounts receivable and unbilled receivables, net | 0 | 0 |  |  |
Amounts due from affiliated companies | 240,300,000 | 238,100,000 |  |  |
Inventoried costs | 0 | 0 |  |  |
Other current assets | 3,100,000 | 3,700,000 |  |  |
Current assets of discontinued operations | 0 | 0 |  |  |
Total current assets | 361,600,000 | 363,100,000 |  |  |
Property, plant and equipment, net | 1,700,000 | 1,900,000 |  |  |
Goodwill | 0 | 0 |  |  |
Intangible assets, net | 0 | 0 |  |  |
Investment in subsidiaries | 475,400,000 | 471,100,000 |  |  |
Other assets | 800,000 | 800,000 |  |  |
Non-current assets of discontinued operations | 0 | 0 |  |  |
Total assets | 839,500,000 | 836,900,000 |  |  |
Current liabilities: |  |  |  |  |
Accounts payable | 2,200,000 | 2,300,000 |  |  |
Accrued expenses | 8,700,000 | 5,700,000 |  |  |
Accrued compensation | 5,000,000 | 5,600,000 |  |  |
Billings in excess of costs and earnings on uncompleted contracts | 0 | 0 |  |  |
Amounts due to affiliated companies | 0 | 0 |  |  |
Other current liabilities | 700,000 | 1,400,000 |  |  |
Current liabilities of discontinued operations | 600,000 | 1,000,000 |  |  |
Total current liabilities | 17,200,000 | 16,000,000 |  |  |
Long-term debt, net of current portion | 293,600,000 | 293,500,000 |  |  |
Other long-term liabilities | 12,400,000 | 12,100,000 |  |  |
Non-current liabilities of discontinued operations | 3,800,000 | 3,800,000 |  |  |
Total liabilities | 327,000,000 | 325,400,000 |  |  |
Total stockholders’ equity | 512,500,000 | 511,500,000 |  |  |
Total liabilities and stockholders’ equity | 839,500,000 | 836,900,000 |  |  |
Subsidiary Guarantors on a Combined Basis |  |  |  |  |
Current assets: |  |  |  |  |
Cash, cash equivalents and restricted cash | (1,600,000) | (1,100,000) |  |  |
Accounts receivable and unbilled receivables, net | 181,800,000 | 183,800,000 |  |  |
Amounts due from affiliated companies | 0 | 0 |  |  |
Inventoried costs | 29,900,000 | 30,800,000 |  |  |
Other current assets | 12,100,000 | 13,500,000 |  |  |
Current assets of discontinued operations | 52,100,000 | 58,600,000 |  |  |
Total current assets | 274,300,000 | 285,600,000 |  |  |
Property, plant and equipment, net | 53,000,000 | 49,300,000 |  |  |
Goodwill | 382,800,000 | 382,800,000 |  |  |
Intangible assets, net | 14,600,000 | 15,800,000 |  |  |
Investment in subsidiaries | 72,700,000 | 70,000,000 |  |  |
Other assets | 7,000,000 | 7,300,000 |  |  |
Non-current assets of discontinued operations | 38,800,000 | 38,800,000 |  |  |
Total assets | 843,200,000 | 849,600,000 |  |  |
Current liabilities: |  |  |  |  |
Accounts payable | 25,200,000 | 27,900,000 |  |  |
Accrued expenses | 29,800,000 | 33,600,000 |  |  |
Accrued compensation | 25,600,000 | 20,700,000 |  |  |
Billings in excess of costs and earnings on uncompleted contracts | 36,000,000 | 38,200,000 |  |  |
Amounts due to affiliated companies | 207,600,000 | 206,400,000 |  |  |
Other current liabilities | 2,300,000 | 4,300,000 |  |  |
Current liabilities of discontinued operations | 22,500,000 | 28,100,000 |  |  |
Total current liabilities | 349,000,000 | 359,200,000 |  |  |
Long-term debt, net of current portion | 0 | 0 |  |  |
Other long-term liabilities | 4,700,000 | 5,100,000 |  |  |
Non-current liabilities of discontinued operations | 2,100,000 | 2,200,000 |  |  |
Total liabilities | 355,800,000 | 366,500,000 |  |  |
Total stockholders’ equity | 487,400,000 | 483,100,000 |  |  |
Total liabilities and stockholders’ equity | 843,200,000 | 849,600,000 |  |  |
Non-Guarantors on a Combined Basis |  |  |  |  |
Current assets: |  |  |  |  |
Cash, cash equivalents and restricted cash | 11,600,000 | 10,700,000 |  |  |
Accounts receivable and unbilled receivables, net | 27,100,000 | 28,500,000 |  |  |
Amounts due from affiliated companies | 0 | 0 |  |  |
Inventoried costs | 18,300,000 | 18,200,000 |  |  |
Other current assets | 4,500,000 | 3,400,000 |  |  |
Current assets of discontinued operations | 0 | 0 |  |  |
Total current assets | 61,500,000 | 60,800,000 |  |  |
Property, plant and equipment, net | 6,800,000 | 6,800,000 |  |  |
Goodwill | 42,900,000 | 42,900,000 |  |  |
Intangible assets, net | 5,700,000 | 6,200,000 |  |  |
Investment in subsidiaries | 0 | 0 |  |  |
Other assets | 0 | 0 |  |  |
Non-current assets of discontinued operations | 0 | 0 |  |  |
Total assets | 116,900,000 | 116,700,000 |  |  |
Current liabilities: |  |  |  |  |
Accounts payable | 3,900,000 | 4,500,000 |  |  |
Accrued expenses | 1,900,000 | 3,300,000 |  |  |
Accrued compensation | 3,500,000 | 3,900,000 |  |  |
Billings in excess of costs and earnings on uncompleted contracts | 2,200,000 | 4,600,000 |  |  |
Amounts due to affiliated companies | 32,700,000 | 31,700,000 |  |  |
Other current liabilities | 4,800,000 | 3,700,000 |  |  |
Current liabilities of discontinued operations | 100,000 | 100,000 |  |  |
Total current liabilities | 49,100,000 | 51,800,000 |  |  |
Long-term debt, net of current portion | 0 | 0 |  |  |
Other long-term liabilities | 7,100,000 | 6,900,000 |  |  |
Non-current liabilities of discontinued operations | 0 | 0 |  |  |
Total liabilities | 56,200,000 | 58,700,000 |  |  |
Total stockholders’ equity | 60,700,000 | 58,000,000 |  |  |
Total liabilities and stockholders’ equity | 116,900,000 | $ 116,700,000 |  |  |
Senior notes | 7% Senior Notes due 2019 |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |
Principal | $ 300,000,000 |  |  |  | $ 625,000,000.0

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