Schedule II-Valuation And Qualifying Accounts (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 25, 2021	Dec. 26, 2020	Dec. 28, 2019
Allowance for doubtful accounts
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at beginning of year	$ 1,538	$ 770	$ 836
Charged to costs and expenses	1,216	1,208	(81)
Other additions	0	0	263
Deductions	164	440	248
Balance at end of year	2,590	1,538	770
Environmental reserves
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at beginning of year	24,001	20,866	23,619
Charged to costs and expenses	4,964	4,242	1,659
Other additions	0	0	0
Deductions	1,539	1,107	4,412
Balance at end of year	27,426	24,001	20,866
Valuation allowance for deferred tax assets
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at beginning of year	27,199	23,130	25,311
Charged to costs and expenses	108	2,317	2,919
Other additions	642	1,898	290
Deductions	1,325	146	5,390
Balance at end of year	$ 26,624	$ 27,199	$ 23,130