Income Taxes - Net Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 26, 2021	Dec. 27, 2020
Deferred tax assets
Retirement, postemployment and deferred compensation plans	$ 86,886	$ 103,433
Accruals for other employee benefits, compensation, insurance and other	34,999	25,899
Net operating losses	1,018	1,510
Operating lease liabilities	19,663	16,648
Other	31,379	32,664
Gross deferred tax assets	173,945	180,154
Valuation allowance	(261)	(293)
Net deferred tax assets	173,684	179,861
Deferred tax liabilities
Property, plant and equipment	38,855	41,832
Intangible assets	7,738	7,652
Operating lease right-of-use assets	16,960	14,196
Other	14,331	16,663
Gross deferred tax liabilities	77,884	80,343
Net deferred tax asset	$ 95,800	$ 99,518
Valuation allowance, period for recoverability measurement (in years)	3 years