Income Taxes - Net Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 29, 2019	Dec. 30, 2018
Deferred tax assets
Retirement, postemployment and deferred compensation plans	$ 113,306	$ 128,926
Accruals for other employee benefits, compensation, insurance and other	25,543	22,722
Net operating losses	1,289	1,598
Operating lease liabilities	16,746
Other	27,042	23,400
Gross deferred tax assets	183,926	176,646
Deferred tax liabilities
Property, plant and equipment	39,494	38,268
Intangible assets	7,596	7,225
Operating lease right-of-use assets	14,309
Other	7,298	2,722
Gross deferred tax liabilities	68,697	48,215
Net deferred tax asset	$ 115,229	$ 128,431
Valuation allowance, period for recoverability measurement	3 years