Long-Term Debt - Summary (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Jun. 30, 2022	Apr. 22, 2021	Apr. 05, 2021	Dec. 07, 2019	Dec. 06, 2019	Sep. 27, 2019
Long-term debt
Debt, gross	$ 656,680
Long-term debt, net	619,343		$ 614,948
Accrual of payment-in-kind interest on Second Lien Credit Facility	$ 2,709	$ 4,949
Weighted average interest rate (as a percent)	9.10%	8.80%
Interest payable	$ 16,600
7.750% Senior Secured Notes due 2026
Long-term debt
Debt, gross	350,000		350,000
Unamortized discount and other debt issuance costs	(4,337)		(4,599)
Total debt, net	$ 345,663		345,401
Interest rate (as a percent)	7.75%			7.75%
Principal Amount				$ 350,000
Second Lien Facility
Long-term debt
Debt, gross	$ 220,430		217,721
Unamortized discount and other debt issuance costs	(31,009)		(32,308)
Total debt, net	189,421		185,413
Principal Amount	190,000		190,000		$ 190,000
Exit fee	5,700		5,700
Accrual of payment-in-kind interest on Second Lien Credit Facility	24,700		22,000
4.50% Convertible Senior Notes due 2026
Long-term debt
Debt, gross	86,250		86,250
Unamortized discount and other debt issuance costs	(1,991)		(2,116)
Total debt, net	$ 84,259		$ 84,134
Interest rate (as a percent)	4.50%
Principal Amount								$ 86,300
ABL Credit Facility
Long-term debt
Maximum borrowing capacity	$ 45,000					$ 45,000	$ 30,000