Leases - Summary of Other Information Concerning the Company's Operating Lease (Detail) - USD ($) |
Mar. 31, 2025 |
Sep. 30, 2024 |
Sep. 30, 2020 |
Aug. 28, 2020 |
|---|---|---|---|---|
| Lessee, Lease, Description [Line Items] | ||||
| Current operating lease liability | $ 366,000 | $ 330,000 | ||
| Non-current operating lease liability | 156,000 | 0 | ||
| New Lease Agreement [Member] | ||||
| Lessee, Lease, Description [Line Items] | ||||
| Operating lease ROU asset included in other long-term assets | 522,000 | 330,000 | $ 970,000 | $ 352,000 |
| Blaw Knox Product Line From Volvo CE [Member] | New Lease Agreement [Member] | ||||
| Lessee, Lease, Description [Line Items] | ||||
| Current operating lease liability | 366,000 | 330,000 | ||
| Non-current operating lease liability | $ 156,000 | $ 0 | ||
| Weighted average remaining lease term (in years) | 9 months 29 days | 11 months 1 day | ||
| Weighted average discount rate used in calculating ROU asset | 4.80% | 5.00% |