Summary of Significant Accounting Policies and Recently Issued Accounting Standards Significant Accounting Policies - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Jan. 04, 2020	Oct. 03, 2020	Sep. 28, 2019	Sep. 30, 2018
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Percentage of active participants (less than)	10.00%
Amortization period of deferred pension losses			7 years
Accounting Standards Update 2014-09
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Adoption of new revenue recognition standard (ASC 606) adjustment				$ (714)
Scenario, Forecast | Subsequent Event
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Amortization period of deferred pension losses		23 years