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Inventories | 9 Months Ended
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Jun. 30, 2023
Inventory Disclosure [Abstract] |
Inventories | 7. Inventories The following is a summary of inventories at June 30, 2023 and September 30, 2022 (in thousands):
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | June 30, |  | September 30,
​ |  | 2023 |  | 2022
​ |  | ​ |  |  |  |
Raw materials and purchased parts |  | $ | 65,380 |  | $ | 39,685
Work-in-process |  | ​ | 8,088 |  | ​ | 4,816
Finished goods |  | ​ | 68,634 |  | ​ | 41,043
Total inventories |  | $ | 142,102 |  | $ | 85,544
​ Reserves related to write downs or adjustments of inventory to net realizable value were $4.3 million and $4.1 million, respectively, at June 30, 2023 and September 30, 2022.

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- Definition The entire disclosure for inventory. Includes, but is not limited to, the basis of stating inventory, the method of determining inventory cost, the classes of inventory, and the nature of the cost elements included in inventory. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 330 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org//330/tableOfContent + Details
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