Condensed Consolidated Statements of Comprehensive Income (Unaudited) (Parenthetical) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 26, 2019	Jun. 27, 2018	Jun. 26, 2019	Jun. 27, 2018
Statement of Comprehensive Income [Abstract]
Tax effect of minimum pension liabtility adjustment	$ 5	$ 7	$ 11	$ 13
Tax effect on changes in fair value of cash flow hedges	(3,701)	1,117	(8,323)	68
Tax effect on amounts reclassified to earnings of cash flow hedges	$ (3)	$ 58	$ (10)	$ 22

Amount, before reclassification, of tax expense (benefit) for gain (loss) from derivative instrument designated and qualifying as cash flow hedge included in assessment of hedge effectiveness.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 12
-URI http://asc.fasb.org/extlink&oid=114867106&loc=d3e640-108580

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Amount of tax expense (benefit) for reclassification of gain (loss) from accumulated other comprehensive income (AOCI) for derivative instrument designated and qualifying as cash flow hedge included in assessment of hedge effectiveness.

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Amount, after reclassification adjustment, of tax (expense) benefit for (increase) decrease in accumulated other comprehensive income of defined benefit plan.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
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-Name Accounting Standards Codification
-Topic 810
-SubTopic 10
-Section 45
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