Employee Benefit Plans - Reclassifications from Accumulated Other Comprehensive Income (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
Sep. 26, 2020	Sep. 26, 2020
Retirement Benefits [Abstract]
Amortization of actuarial loss - total before tax	$ 248	$ 744
Tax benefit	(59)	(177)
Net of tax	$ 189	$ 567

Amount, before tax, of reclassification adjustment from accumulated other comprehensive income (loss) for gain (loss) of defined benefit plan.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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Balance Type:	debit
Period Type:	duration