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Note 11 - Supplementary Balance Sheet Information (Tables) | 12 Months Ended
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Sep. 30, 2024
Notes Tables |
Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block] |
|  | September 30, |
|  | 2024 |  |  | 2023 |
Accounts receivable |  | $ | 179,269 |  |  | $ | 164,592 |
Less allowance for expected credit losses |  |  | (6,558 | ) |  |  | (8,057 | )
Accounts receivable, net |  | $ | 172,711 |  |  | $ | 156,535 |
Accounts Receivable, Allowance for Credit Loss [Table Text Block] |
|  | Year Ended September 30, |
|  | 2024 |  |  | 2023 |  |  | 2022 |
Balance at beginning of period |  | $ | 8,057 |  |  | $ | 5,162 |  |  | $ | 4,318 |
Provisions |  |  | 7,250 |  |  |  | 8,849 |  |  |  | 3,536 |
Payments received |  |  | (7,455 | ) |  |  | (5,884 | ) |  |  | (2,278 | )
Write-offs and adjustments |  |  | (1,294 | ) |  |  | (70 | ) |  |  | (414 | )
Balance at end of period |  | $ | 6,558 |  |  | $ | 8,057 |  |  | $ | 5,162 |
Schedule of Inventory, Current [Table Text Block] |
|  | September 30, |
|  | 2024 |  |  | 2023 |
Raw materials and purchased parts |  | $ | 57,230 |  |  | $ | 59,861 |
Work-in-process |  |  | 9,118 |  |  |  | 11,400 |
Finished goods |  |  | 48,908 |  |  |  | 56,937 |
Total inventories |  | $ | 115,256 |  |  | $ | 128,198 |
|  | Year Ended September 30, |
|  | 2024 |  |  | 2023 |  |  | 2022 |
Balance at beginning of period |  | $ | 4,991 |  |  | $ | 4,082 |  |  | $ | 3,681 |
Provisions |  |  | 8,186 |  |  |  | 3,324 |  |  |  | 1,752 |
Inventory disposals and adjustments |  |  | (3,022 | ) |  |  | (2,415 | ) |  |  | (1,351 | )
Balance at end of period |  | $ | 10,155 |  |  | $ | 4,991 |  |  | $ | 4,082 |
Summary of Valuation Allowance [Table Text Block] |
|  | Year Ended September 30, |
|  | 2024 |  |  | 2023 |  |  | 2022 |
Balance at beginning of period |  | $ | 8,348 |  |  | $ | 5,927 |  |  | $ | 8,592 |
Charge to income tax provision (benefit) |  |  | 37,677 |  |  |  | 1,137 |  |  |  | 1,337 |
Charged to other accounts |  |  | 1,840 |  |  |  | 1,284 |  |  |  | (4,002 | )
Balance at end of period |  | $ | 47,865 |  |  | $ | 8,348 |  |  | $ | 5,927 |
Schedule of Product Warranty Liability [Table Text Block] |
|  | Year Ended September 30, |
|  | 2024 |  |  | 2023 |  |  | 2022 |
Balance at beginning of period |  | $ | 10,223 |  |  | $ | 2,890 |  |  | $ | 2,330 |
Adjustments for acquisitions and divestitures |  |  | — |  |  |  | 2,475 |  |  |  | 254 |
Accruals for warranties during the year |  |  | 2,736 |  |  |  | 8,198 |  |  |  | 2,438 |
Costs incurred during the year |  |  | (2,830 | ) |  |  | (3,340 | ) |  |  | (2,132 | )
Balance at end of period |  | $ | 10,129 |  |  | $ | 10,223 |  |  | $ | 2,890 |

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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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