Debt - Additional Information (Details) - USD ($) $ in Thousands			9 Months Ended
	Jul. 01, 2019	Feb. 15, 2019	Jun. 30, 2021	Oct. 04, 2017
Debt Instrument [Line Items]
Deferred financing costs			$ 349
Senior Secured Term Loan Facility | Secured Debt
Debt Instrument [Line Items]
Prepayments as a percentage of the preceding year excess cash flow (as a percent)			50.00%
Deferred financing costs			$ 300
Weighted average interest rate (as a percent)			2.80%
Interest expense			$ 1,300
Deferred financing costs amortization			$ 200
Interest rate above applicable rate (as a percent)				2.00%
Debt extinguished	$ 147,000
Senior Secured Incremental Term Loan Facility | Secured Debt
Debt Instrument [Line Items]
Debt extinguished	$ 348,300	$ 340,100