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Supplementary Balance Sheet Information | 3 Months Ended
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Dec. 31, 2023
Organization, Consolidation and Presentation of Financial Statements [Abstract] |
Supplementary Balance Sheet Information | 8. Supplementary Balance Sheet Information Inventories The following is a summary of inventories at December 31, 2023 and September 30, 2023 (in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | December 31, |  | September 30,
​ |  | 2023 |  | 2023
​ |  | ​ |  |  |  |
Raw materials and purchased parts |  | $ | 57,984 |  | $ | 59,861
Work-in-process |  | ​ | 12,460 |  | ​ | 11,400
Finished goods |  | ​ | 56,740 |  | ​ | 56,937
Total inventories |  | $ | 127,184 |  | $ | 128,198
​ Reserves related to write downs of inventory to net realizable value were $5.1 million and $5.0 million, respectively, at December 31, 2023 and September 30, 2023. Warranty and Retrofit Costs The following is a summary of product and warranty retrofit activity for the three months ended December 31, 2023 and 2022 (in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | Three Months Ended December 31,
​ | ​ | ​ | 2023 | ​ | 2022
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | Balance at beginning of period | ​ | $ | 10,223 | ​ | $ | 2,890
​ | Adjustment for acquisitions | ​ | ​ | — | ​ | ​ | 2,303
​ | Accruals for warranties during the period | ​ | ​ | 692 | ​ | ​ | 307
​ | Costs incurred during the period | ​ | ​ | (868) | ​ | ​ | (321)
​ | Balance at end of period | ​ | $ | 10,047 | ​ | $ | 5,179

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- Definition The entire disclosure for supplemental balance sheet disclosures, including descriptions and amounts for assets, liabilities, and equity. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 210 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org//210/tableOfContent + Details
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