Accounts Receivable, Net and Supplemental Balance-Sheet Information (Details) - USD ($) $ in Thousands	Jul. 02, 2022	Dec. 31, 2021
Accounts receivable, net
Accounts receivable	$ 234,688	$ 215,336
Unbilled receivables(1)	88,464	65,957
Accounts receivable, gross	323,152	281,293
Less allowances for credit losses	3,307	3,013
Accounts receivable, net	319,845	278,280
Other current assets
Refundable income taxes	716	1,346
Prepaid expenses	16,250	30,911
Assets invested for self-insurance	9,257	4,250
Other	1,530	1,346
Total	27,753	37,853
Property, Plant and Equipment, Net [Abstract]
Land and Land Improvements	24,743	22,129
Buildings and leasehold improvements	70,379	63,933
Equipment	665,841	646,552
Property, Plant and Equipment, Gross	760,963	732,614
Less accumulated depreciation	507,596	504,629
Property and equipment, net	253,367	227,985
Other Assets, Noncurrent [Abstract]
Investment--cost-method affiliate	1,258	1,258
Deferred income taxes	5,158	4,937
Cloud computing arrangements	4,073	6,530
Other	4,596	4,539
Total	15,085	17,264
Accrued expenses
Employee compensation	27,490	37,828
Accrued compensated absences	12,047	11,007
Self-insured medical claims	4,737	2,891
Income tax payable	4,075	145
Customer advances, deposits	4,331	4,009
Taxes, other than income	17,701	13,789
Other	5,604	5,469
Total	75,985	75,138
Other current liabilities
Current operating lease liabilities	31,641	28,682
Current portion of long-term debt	8,403	22,809
Self-insurance accruals	46,453	48,867
Total	78,094	77,549
Other noncurrent liabilities
Non-qualified retirement plans	9,231	8,713
Other	3,048	2,870
Total	$ 12,279	$ 11,583