Debt - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Jun. 30, 2018	Jun. 30, 2018	Oct. 04, 2017
Debt Instrument [Line Items]
Deferred financing costs	$ 2,530	$ 2,530
Senior Secured Term Loan Facility | Secured Debt
Debt Instrument [Line Items]
Deferred financing costs	$ 2,500	2,500
Weighted average interest rate (as a percent)	4.50%
Interest expense		6,600
Deferred financing costs amortization		$ 300
Interest rate above applicable rate (as a percent)			2.00%