Accounts Receivable, Net and Supplemental Balance-Sheet Information (Details) - USD ($) $ in Thousands	Mar. 30, 2024	Dec. 31, 2023
Accounts receivable, net
Accounts receivable	$ 238,553	$ 263,426
Unbilled receivables	110,242	99,485
Accounts receivable, gross	348,795	362,911
Less allowances for credit losses	3,659	2,441
Accounts receivable, net	345,136	360,470
Other current assets
Refundable income taxes	3,545	0
Prepaid expenses	30,947	44,534
Mitigation bank credit inventory	24,636	28,385
Assets invested for self-insurance	21,183	20,959
Payroll taxes refundable	21,618	22,591
Other	163	302
Total	102,092	116,771
Property, Plant and Equipment, Net [Abstract]
Land and land improvements	28,435	28,177
Buildings and leasehold improvements	106,854	99,964
Equipment	704,250	684,562
Property, plant and equipment, gross	839,539	812,703
Less accumulated depreciation	502,018	500,025
Property and equipment, net	337,521	312,678
Other Assets, Noncurrent [Abstract]
Investment--cost-method affiliate	1,630	1,405
Deferred income taxes	6,001	6,001
Cloud computing arrangements	67	107
Other	4,309	4,362
Total	12,007	11,875
Accrued expenses
Employee compensation	17,387	40,656
Accrued compensated absences	14,913	14,483
Self-insured medical claims	1,189	2,309
Income tax payable	808	1,135
Customer advances, deposits	3,296	1,275
Taxes, other than income	6,970	6,017
Other	13,827	16,069
Total	58,390	81,944
Other current liabilities
Notes payable	2,499	543
Current operating lease liabilities	39,602	39,043
Current portion of long-term debt	31,987	40,429
Self-insurance accruals	49,043	50,379
Total	91,144	89,965
Other noncurrent liabilities
Non-qualified retirement plans	5,808	5,630
Other	5,798	6,096
Other noncurrent liabilities	$ 11,606	$ 11,726