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Segment Information - Segment Information (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2018 | Dec. 30, 2017 | Dec. 31, 2016 | Oct. 01, 2016 | Dec. 30, 2017 | Dec. 31, 2016 | Dec. 26, 2015
Segment Reporting Information, Income (Loss) before Income Taxes [Abstract] |  |  |  |  |  |  |
Net sales |  |  |  |  | $ 2,266,073 | $ 2,055,622 | $ 2,100,002
Cost of goods sold |  |  |  |  | 1,940,617 | 1,723,499 | 1,809,702
Depreciation and amortization |  |  |  |  | 33,944 | 35,133 | 34,608
Selling, general, and administrative expense |  |  |  |  | 139,580 | 137,499 | 130,358
Gain on sale of businesses |  |  |  |  | (1,491) | 0 | (15,376)
Severance |  |  |  |  | 0 | 0 | 3,442
Impairment charges |  | $ 1,100 | $ 3,800 | $ 3,000 | 1,466 | 6,778 | 0
Operating income |  |  |  |  | 151,957 | 152,713 | 137,268
Interest expense |  |  |  |  | (19,502) | (7,387) | (7,667)
Environmental expense |  |  |  |  | (7,284) | (1,279) | (46)
Other income, net |  |  |  |  | 1,801 | 1,983 | 2,234
Income before income taxes |  |  |  |  | 126,972 | 146,030 | 131,789
Expenditures for long-lived assets |  |  |  |  | 48,155 | 61,688 | 71,012
Impairment charges |  | 1,100 | 3,800 | $ 3,000 | 1,466 | 6,778 | 0
Segment assets |  | 1,320,173 | 1,447,476 |  | 1,320,173 | 1,447,476 | 1,338,801
Intersegment Eliminations [Member] |  |  |  |  |  |  |
Segment Reporting Information, Income (Loss) before Income Taxes [Abstract] |  |  |  |  |  |  |
Net sales |  |  |  |  | (32,456) | (14,785) | (14,881)
Cost of goods sold |  |  |  |  | (34,368) | (16,282) | (14,688)
Depreciation and amortization |  |  |  |  | 2,138 | 2,113 | 2,289
Selling, general, and administrative expense |  |  |  |  | 43,452 | 46,458 | 43,383
Gain on sale of businesses |  |  |  |  | 0 |  | 0
Severance |  |  |  |  |  |  | 0
Impairment charges |  |  |  |  | 0 | 0 |
Operating income |  |  |  |  | (43,678) | (47,074) | (45,865)
Impairment charges |  |  |  |  | 0 | 0 |
Piping Systems [Member] | Operating Segments [Member] |  |  |  |  |  |  |
Segment Reporting Information, Income (Loss) before Income Taxes [Abstract] |  |  |  |  |  |  |
Net sales |  |  |  |  | 1,564,950 | 1,429,589 | 1,436,689
Cost of goods sold |  |  |  |  | 1,369,161 | 1,228,949 | 1,245,929
Depreciation and amortization |  |  |  |  | 21,777 | 22,421 | 22,559
Selling, general, and administrative expense |  |  |  |  | 74,479 | 68,218 | 66,903
Gain on sale of businesses |  |  |  |  | (1,491) |  | (15,376)
Severance |  |  |  |  |  |  | 3,442
Impairment charges |  |  |  |  | 1,500 | 6,115 |
Operating income |  |  |  |  | 99,558 | 103,886 | 113,232
Expenditures for long-lived assets |  |  |  |  | 18,124 | 56,286 | 41,900
Impairment charges |  |  |  |  | 1,500 | 6,115 |
Segment assets |  | 801,468 | 826,663 |  | 801,468 | 826,663 | 811,343
Industrial Metals [Member] | Operating Segments [Member] |  |  |  |  |  |  |
Segment Reporting Information, Income (Loss) before Income Taxes [Abstract] |  |  |  |  |  |  |
Net sales |  |  |  |  | 602,131 | 521,060 | 567,467
Cost of goods sold |  |  |  |  | 506,973 | 420,905 | 491,567
Depreciation and amortization |  |  |  |  | 7,516 | 8,162 | 7,503
Selling, general, and administrative expense |  |  |  |  | 11,890 | 13,162 | 10,955
Gain on sale of businesses |  |  |  |  | 0 |  | 0
Severance |  |  |  |  |  |  | 0
Impairment charges |  |  |  |  | 0 | 663 |
Operating income |  |  |  |  | 75,752 | 78,168 | 57,442
Expenditures for long-lived assets |  |  |  |  | 5,322 | 3,302 | 16,603
Impairment charges |  |  |  |  | 0 | 663 |
Segment assets |  | 212,638 | 160,478 |  | 212,638 | 160,478 | 153,102
Climate [Member] | Operating Segments [Member] |  |  |  |  |  |  |
Segment Reporting Information, Income (Loss) before Income Taxes [Abstract] |  |  |  |  |  |  |
Net sales |  |  |  |  | 131,448 | 119,758 | 110,727
Cost of goods sold |  |  |  |  | 98,851 | 89,927 | 86,894
Depreciation and amortization |  |  |  |  | 2,513 | 2,437 | 2,257
Selling, general, and administrative expense |  |  |  |  | 9,759 | 9,661 | 9,117
Gain on sale of businesses |  |  |  |  | 0 |  | 0
Severance |  |  |  |  |  |  | 0
Impairment charges |  |  |  |  | 0 | 0 |
Operating income |  |  |  |  | 20,325 | 17,733 | 12,459
Expenditures for long-lived assets |  |  |  |  | 2,191 | 2,045 | 12,373
Impairment charges |  |  |  |  | 0 | 0 |
Segment assets |  | 73,458 | 66,968 |  | 73,458 | 66,968 | 61,672
Corporate Segment [Member] |  |  |  |  |  |  |
Segment Reporting Information, Income (Loss) before Income Taxes [Abstract] |  |  |  |  |  |  |
Expenditures for long-lived assets |  |  |  |  | 22,518 | 55 | 136
Segment assets |  | $ 232,609 | $ 393,367 |  | $ 232,609 | $ 393,367 | $ 312,684
Forecast [Member] | Aircraft [Member] | Held-for-sale [Member] |  |  |  |  |  |  |
Segment Reporting Information, Income (Loss) before Income Taxes [Abstract] |  |  |  |  |  |  |
Impairment charges | $ 3,300 |  |  |  |  |  |
Impairment charges | $ 3,300 |  |  |  |  |  |

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