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Income Taxes (Schedule of Deferred Income Taxes) (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 25, 2020
Deferred Tax Assets, Net [Abstract]
Inventory valuations	$ 1,181	$ 586
Accrued self-insurance retentions	1,534	1,164
Accrued warranty and service liabilities	2,285	2,062
Vacation accruals	3,261	3,249
Customer allowances	4,028	3,650
Excess of tax over book depreciation and amortization	(39,785)	(49,377)
Pension benefit obligation	16,022	30,942
Postretirement medical benefit obligation	5,028	4,808
Acquisition costs	0	389
Stock compensation	11,442	11,743
Deferred compensation	2,595	2,075
Net operating loss carryforward	0	440
Deferred revenue	2,427	1,792
Prepayments from foreign subsidiaries	32,969	0
Other	2,138	2,041
Net deferred tax assets	$ 45,125	$ 15,564

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The tax effect as of the balance sheet date of the amount of estimated future tax deductions arising from acquisition costs related to business combinations, which can only be deducted for tax purposes when actual costs are incurred, and which can only be realized if sufficient tax-basis income is generated in future periods to enable the deduction to be taken.

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