Debt - Additional Information (Details) - USD ($) $ in Thousands			12 Months Ended
	Jul. 01, 2019	Feb. 15, 2019	Sep. 30, 2021	Sep. 30, 2020	Oct. 04, 2017
Debt Instrument [Line Items]
Deferred financing costs			$ 323
Deferred financing costs amortization			300	$ 200
Senior Secured Term Loan Facility | Secured Debt
Debt Instrument [Line Items]
Deferred financing costs			$ 300
Weighted average interest rate (as a percent)			2.80%
Interest expense			$ 1,700
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