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Segment Information (Details) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Oct. 01, 2016 USD ($) | Apr. 02, 2016 Segment | Sep. 26, 2015 USD ($) | Oct. 01, 2016 USD ($) | Sep. 26, 2015 USD ($) | Dec. 26, 2015 USD ($) Segment
Segment Information [Abstract] |  |  |  |  |  |
Number of reportable segments | Segment |  | 3 |  |  |  | 2
Summary of segment information [Abstract] |  |  |  |  |  |
Net sales | $ 506,584 |  | $ 535,184 | $ 1,583,464 | $ 1,628,019 |
Cost of goods sold | 424,668 |  | 467,167 | 1,327,370 | 1,398,366 |
Depreciation and amortization | 9,016 |  | 8,749 | 26,997 | 24,790 |
Selling, general, and administrative expense | 32,413 |  | 32,241 | 102,707 | 97,922 |
Asset impairments | 3,000 |  | 0 | 3,000 | 570 |
Gain on sale of assets | 0 |  | 0 | 0 | (15,376) |
Severance | 0 |  | 0 | 0 | 3,442 |
Operating income | 37,487 |  | 27,027 | 123,390 | 118,305 |
Interest expense | (1,830) |  | (1,682) | (5,370) | (5,977) |
Other income, net | 120 |  | 164 | 880 | 534 |
Income before income taxes | 35,777 |  | 25,509 | 118,900 | 112,862 |
Segment assets | 1,426,121 |  |  | 1,426,121 |  | $ 1,338,801
Piping Systems [Member] |  |  |  |  |  |
Summary of segment information [Abstract] |  |  |  |  |  |
Segment assets | 855,036 |  |  | 855,036 |  | 811,343
Industrial Metals [Member] |  |  |  |  |  |
Summary of segment information [Abstract] |  |  |  |  |  |
Segment assets | 160,413 |  |  | 160,413 |  | 153,102
Climate [Member] |  |  |  |  |  |
Summary of segment information [Abstract] |  |  |  |  |  |
Segment assets | 61,713 |  |  | 61,713 |  | 61,672
General Corporate [Member] |  |  |  |  |  |
Summary of segment information [Abstract] |  |  |  |  |  |
Segment assets | 348,959 |  |  | 348,959 |  | $ 312,684
Operating Segments [Member] | Piping Systems [Member] |  |  |  |  |  |
Summary of segment information [Abstract] |  |  |  |  |  |
Net sales | 351,557 |  | 367,892 | 1,109,109 | 1,109,124 |
Cost of goods sold | 301,867 |  | 320,571 | 949,015 | 959,599 |
Depreciation and amortization | 5,905 |  | 5,430 | 17,341 | 15,952 |
Selling, general, and administrative expense | 16,647 |  | 16,469 | 51,497 | 50,021 |
Asset impairments | 3,000 |  |  | 3,000 | 570 |
Gain on sale of assets |  |  |  |  | (15,376) |
Severance |  |  |  |  | 3,442 |
Operating income | 24,138 |  | 25,422 | 88,256 | 94,916 |
Operating Segments [Member] | Industrial Metals [Member] |  |  |  |  |  |
Summary of segment information [Abstract] |  |  |  |  |  |
Net sales | 131,350 |  | 139,472 | 393,608 | 435,736 |
Cost of goods sold | 107,512 |  | 125,146 | 321,615 | 373,678 |
Depreciation and amortization | 1,964 |  | 2,154 | 6,219 | 5,452 |
Selling, general, and administrative expense | 3,125 |  | 3,044 | 9,989 | 8,044 |
Asset impairments | 0 |  |  | 0 | 0 |
Gain on sale of assets |  |  |  |  | 0 |
Severance |  |  |  |  | 0 |
Operating income | 18,749 |  | 9,128 | 55,785 | 48,562 |
Operating Segments [Member] | Climate [Member] |  |  |  |  |  |
Summary of segment information [Abstract] |  |  |  |  |  |
Net sales | 30,003 |  | 28,494 | 92,068 | 85,803 |
Cost of goods sold | 22,210 |  | 22,160 | 68,363 | 67,561 |
Depreciation and amortization | 612 |  | 608 | 1,829 | 1,647 |
Selling, general, and administrative expense | 2,357 |  | 2,283 | 7,336 | 6,637 |
Asset impairments | 0 |  |  | 0 | 0 |
Gain on sale of assets |  |  |  |  | 0 |
Severance |  |  |  |  | 0 |
Operating income | 4,824 |  | 3,443 | 14,540 | 9,958 |
Corporate and Eliminations [Member] |  |  |  |  |  |
Summary of segment information [Abstract] |  |  |  |  |  |
Net sales | (6,326) |  | (674) | (11,321) | (2,644) |
Cost of goods sold | (6,921) |  | (710) | (11,623) | (2,472) |
Depreciation and amortization | 535 |  | 557 | 1,608 | 1,739 |
Selling, general, and administrative expense | 10,284 |  | 10,445 | 33,885 | 33,220 |
Asset impairments | 0 |  |  | 0 | 0 |
Gain on sale of assets |  |  |  |  | 0 |
Severance |  |  |  |  | 0 |
Operating income | $ (10,224) |  | $ (10,966) | $ (35,191) | $ (35,131) |

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