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Supplementary Balance Sheet Information (Tables) | 12 Months Ended
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Sep. 30, 2023
Organization, Consolidation and Presentation of Financial Statements [Abstract] |
Summary of accounts receivable | 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
​
Summary of allowance for expected credit losses | ​ ​ 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
​
Summary of inventories | ​ 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
Summary of valuation allowance for deferred tax assets | 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
​
Summary of product warranty and retrofit activity | ​ 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 Tabular disclosure of the various types of trade accounts and notes receivable and for each the gross carrying value, allowance, and net carrying value as of the balance sheet date. Presentation is categorized by current, noncurrent and unclassified receivables. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.3,4) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1 + Details
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- Definition Tabular disclosure of the carrying amount as of the balance sheet date of merchandise, goods, commodities, or supplies held for future sale or to be used in manufacturing, servicing or production process. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(6)(a)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(6)(b)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(6)(c)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 50 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org//1943274/2147483489/210-10-50-1 + Details
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- Definition Tabular disclosure of the changes in the guarantor's aggregate product warranty liability, including the beginning balance of the aggregate product warranty liability, the aggregate reductions in that liability for payments made (in cash or in kind) under the warranty, the aggregate changes in the liability for accruals related to product warranties issued during the reporting period, the aggregate changes in the liability for accruals related to preexisting warranties (including adjustments related to changes in estimates), and the ending balance of the aggregate product warranty liability. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 460 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 8 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482425/460-10-50-8 + Details
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