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Segment Reporting - Schedule of Segment Reporting by Segment (Details) $ in Thousands | 12 Months Ended
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Jan. 03, 2026 USD ($) segment | Dec. 28, 2024 USD ($) | Dec. 30, 2023 USD ($)
Segment Reporting [Abstract] |  |  |
Number of reportable segments | segment | 1 |  |
Segment Reporting Information [Line Items] |  |  |
Net sales | $ 2,954,007 | $ 2,952,532 | $ 3,136,381
Cost of sales | 2,502,379 | 2,463,393 | 2,609,364
Selling, general, and administrative expense | 381,109 | 365,532 | 355,819
Depreciation of property and equipment | 35,400 | 34,600 | 27,800
Amortization of definite-lived intangible assets | 4,500 | 3,900 | 4,200
Recognition of deferred gains on real estate | 3,934 | 3,934 | 3,934
Interest income | 17,326 | 27,805 | 20,908
Settlement of defined benefit pension plan | 0 | (2,481) | 30,440
(Benefit) provision for income taxes | (90) | 17,571 | 33,350
Consolidated net income | 219 | 53,116 | 48,536
Reportable Segment |  |  |
Segment Reporting Information [Line Items] |  |  |
Consolidated net income | 219 | 53,116 | 48,536
Operating Segments | Reportable Segment |  |  |
Segment Reporting Information [Line Items] |  |  |
Net sales | 2,954,007 | 2,952,532 | 3,136,381
Depreciation of property and equipment | 35,424 | 34,576 | 27,846
Amortization of definite-lived intangible assets | 4,481 | 3,912 | 4,197
Recognition of deferred gains on real estate | (3,934) | (3,934) | (3,934)
Interest expense | 49,680 | 47,169 | 44,654
Interest income | (17,326) | (27,805) | (20,908)
Settlement of defined benefit pension plan | 0 | (2,481) | 30,440
Other, net | 2,065 | 1,483 | 7,017
(Benefit) provision for income taxes | (90) | 17,571 | 33,350
Total segment expenses | 2,953,788 | 2,899,416 | 3,087,845
Consolidated net income | 219 | 53,116 | 48,536
Adjustments and reconciling items | Reportable Segment |  |  |
Segment Reporting Information [Line Items] |  |  |
Consolidated net income | 0 | 0 | 0
Cost of specialty products sold |  |  |
Segment Reporting Information [Line Items] |  |  |
Net sales | 2,052,990 | 2,045,910 | 2,184,240
Cost of specialty products sold | Operating Segments | Reportable Segment |  |  |
Segment Reporting Information [Line Items] |  |  |
Cost of sales | 1,683,997 | 1,648,285 | 1,763,446
Cost of structural products sold |  |  |
Segment Reporting Information [Line Items] |  |  |
Net sales | 901,017 | 906,622 | 952,141
Cost of structural products sold | Operating Segments | Reportable Segment |  |  |
Segment Reporting Information [Line Items] |  |  |
Cost of sales | 818,382 | 815,108 | 845,918
SG&A - delivery and logistics | Operating Segments | Reportable Segment |  |  |
Segment Reporting Information [Line Items] |  |  |
Selling, general, and administrative expense | 165,878 | 154,293 | 152,313
SG&A - sales | Operating Segments | Reportable Segment |  |  |
Segment Reporting Information [Line Items] |  |  |
Selling, general, and administrative expense | 73,480 | 68,620 | 67,274
SG&A - all other | Operating Segments | Reportable Segment |  |  |
Segment Reporting Information [Line Items] |  |  |
Selling, general, and administrative expense | $ 141,751 | $ 142,619 | $ 136,232

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