Long-Term Debt - Term Loan Facility (Details) - Line of Credit - USD ($) $ in Thousands		12 Months Ended
	Sep. 12, 2016	Sep. 30, 2017
Senior Secured Credit Facility
Line of Credit Facility [Line Items]
Maximum borrowing capacity	$ 100,000
Interest expense		$ 4,700
Contractual interest expense		4,300
Debt discount amortization		$ 400
Initial Term Loan
Line of Credit Facility [Line Items]
Amount outstanding	50,000
Delayed Draw Term Loans
Line of Credit Facility [Line Items]
Amount outstanding	$ 50,000
Monthly commitment fee percentage	2.75%
Quarterly loan servicing fee	$ 15
LIBOR | Senior Secured Credit Facility
Line of Credit Facility [Line Items]
Basis spread on variable rate	7.50%