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Inventories - Inventories (Details) - USD ($) $ in Thousands | Jun. 30, 2021 | Sep. 30, 2020
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Inventory Disclosure [Abstract] |  |
Finished goods | $ 19,481 | $ 20,798
Work in process | 4,428 | 984
Raw materials | 44,530 | 47,041
Obsolescence reserve | (35,118) | (34,960)
Total | 33,321 | 33,863
Less current portion | (15,170) | (16,933)
Non-current portion | $ 18,151 | $ 16,930

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