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Supplementary Balance Sheet Information | 12 Months Ended
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Sep. 30, 2023
Organization, Consolidation and Presentation of Financial Statements [Abstract] |
Supplementary Balance Sheet Information | 11. Supplementary Balance Sheet Information The following is a summary of accounts receivable at September 30, 2023 and 2022 (in thousands):
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | September 30,
​ |  | 2023 |  | 2022
Accounts receivable | ​ | $ | 164,592 | ​ | $ | 168,920
Less allowance for expected credit losses | ​ |  | (8,057) | ​ |  | (5,162)
Accounts receivable, net | ​ | $ | 156,535 | ​ | $ | 163,758
​ ​ ​ ​ The allowance for expected credit losses for the fiscal years ended September 30, 2023, 2022 and 2021 is as follows (in thousands):
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Year Ended September 30,
​ | ​ | 2023 | ​ | 2022 | ​ | 2021
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Balance at beginning of period | ​ | $ | 5,162 | ​ | $ | 4,318 | ​ | $ | 7,146
Provisions |  | ​ | 8,849 |  | ​ | 3,536 |  | ​ | 3,445
Payments received | ​ | ​ | (5,884) | ​ | ​ | (2,278) | ​ | ​ | (5,481)
Write-offs and adjustments | ​ |  | (70) | ​ | ​ | (414) | ​ | ​ | (792)
Balance at end of period | ​ | $ | 8,057 | ​ | $ | 5,162 | ​ | $ | 4,318
​ ​ ​ The following is a summary of inventories at September 30, 2023 and 2022 (in thousands):
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | September 30,
​ |  | 2023 |  | 2022
​ |  | ​ |  |  | ​ |
Raw materials and purchased parts |  | $ | 59,861 | ​ | $ | 39,685
Work-in-process |  |  | 11,400 | ​ |  | 4,816
Finished goods |  |  | 56,937 | ​ |  | 41,043
Total inventories |  | $ | 128,198 | ​ | $ | 85,544
​ ​ The activity for excess and obsolete inventory reserves is as follows for the fiscal years ended September 30, 2023, 2022 and 2021 (in thousands):
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Year Ended September 30,
​ | ​ | 2023 | ​ | 2022 | ​ | 2021
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Balance at beginning of period | ​ | $ | 4,082 | ​ | $ | 3,681 | ​ | $ | 3,136
Provisions | ​ | ​ | 3,324 | ​ | ​ | 1,752 | ​ | ​ | 1,522
Inventory disposals and adjustments | ​ | ​ | (2,415) | ​ | ​ | (1,351) | ​ | ​ | (977)
Balance at end of period | ​ | $ | 4,991 | ​ | $ | 4,082 | ​ | $ | 3,681
​ The activity for valuation allowance for deferred tax assets is as follows for the fiscal years ended September 30, 2023, 2022 and 2021 (in thousands):
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Year Ended September 30,
​ | ​ | 2023 | ​ | 2022 | ​ | 2021
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Balance at beginning of period | ​ | $ | 5,927 | ​ | $ | 8,592 | ​ | $ | 10,623
Charge to income tax provision (benefit) |  | ​ | 1,137 |  | ​ | 1,337 |  | ​ | (3,247)
Charged to other accounts | ​ | ​ | 1,284 | ​ | ​ | (4,002) | ​ | ​ | 1,216
Balance at end of period | ​ | $ | 8,348 | ​ | $ | 5,927 | ​ | $ | 8,592
​ ​ The following is a summary of product warranty and retrofit activity on a gross basis for the fiscal years ended September 30, 2023, 2022 and 2021 (in thousands):
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | Year Ended September 30,
​ | ​ | 2023 | ​ | 2022 | ​ | 2021
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Balance at beginning of period | ​ | $ | 2,890 | ​ | $ | 2,330 | ​ | $ | 2,211
Adjustments for acquisitions and divestitures | ​ | ​ | 2,475 | ​ | ​ | 254 | ​ | ​ | —
Accruals for warranties during the year | ​ | ​ | 8,198 | ​ | ​ | 2,438 | ​ | ​ | 2,300
Costs incurred during the year | ​ | ​ | (3,340) | ​ | ​ | (2,132) | ​ | ​ | (2,181)
Balance at end of period | ​ | $ | 10,223 | ​ | $ | 2,890 | ​ | $ | 2,330
​

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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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