Leases - Summary of Undiscounted Future Minimum Lease Payments Under Non-cancelable Leases (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Sep. 30, 2020
Operating Leases
2021 (excluding nine months ended June 30, 2021)	$ 1,830
2022	6,250
2023	4,145
2024	3,800
2025	2,351
Thereafter	3,125
Total future minimum lease payments	21,501
Less effects of discounting	(2,847)
Total lease liabilities	18,654
Short-term lease liabilities	5,497	$ 5,700
Long-term lease liabilities	13,157	$ 17,821
Financing Leases
2021 (excluding nine months ended June 30, 2021)	118
2022	469
2023	469
2024	417
2025	362
Thereafter	53
Total future minimum lease payments	1,888
Less effects of discounting	(131)
Total lease liabilities	1,757
Short-term lease liabilities	429
Long-term lease liabilities	1,328
Total
2021 (excluding nine months ended June 30, 2021)	1,948
2022	6,719
2023	4,614
2024	4,217
2025	2,713
Thereafter	3,178
Total future minimum lease payments	23,389
Less effects of discounting	(2,978)
Total lease liabilities	20,411
Short-term lease liabilities	5,926
Long-term lease liabilities	$ 14,485