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Consolidated Statements of Stockholders' Equity (Parenthetical) - USD ($) $ in Thousands	12 Months Ended
	Sep. 27, 2019	Sep. 28, 2018	Sep. 29, 2017
Statement of Stockholders' Equity [Abstract]
Change in pension and retiree medical plan liabilities	$ (30,750)	$ 17,058	$ 24,380
(Gain) loss on derivative deferred taxes	568	(859)	90
Issuances of equity securities deferred taxes		$ 1,015	$ 1,015
Disposition of business, deferred taxes	5,402
Deferred tax from ASC 606	(10,285)
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, Excluding Disposition of Business, Tax	$ 25,348

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