Debt - Summary of Interest Expense (Detail) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2020
Interest expense
Other	$ 3,661	$ 828	$ 1,530
Original issue discounts
Less capitalized interest	(5,622)	(2,157)	(1,288)
Interest expense	24,956	20,311	71,179
Term Loan
Interest expense
Interest expense, debt	8,824	17,826	41,261
Amortization - Debt issue costs
Amortization of debt issuance costs	1,056	2,497	4,910
Original issue discounts
Original issue discounts	126	193	597
2021 Senior Notes [Member]
Interest expense
Interest expense, debt			17,150
Amortization - Debt issue costs
Amortization of debt issuance costs			880
2025 Senior Notes [Member]
Interest expense
Interest expense, debt			3,879
Amortization - Debt issue costs
Amortization of debt issuance costs			180
2022 Term Loan Agreement
Interest expense
Interest expense, debt	10,640
Amortization - Debt issue costs
Amortization of debt issuance costs	4,892
Original issue discounts
Original issue discounts	279
Interest expense	5,100
Revolving Credit Facility [Member]
Interest expense
Interest expense, debt	838	629	1,654
Amortization - Debt issue costs
Amortization of debt issuance costs	$ 262	$ 495	$ 426