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SHAREHOLDERS' EQUITY (Tables) | 9 Months Ended
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Jun. 30, 2026
Stockholders' Equity Note [Abstract] |
Schedule of Components of Accumulated Other Comprehensive Income | Components of accumulated other comprehensive income were as follows:
| June 30, |  | September 30,
(in thousands) | 2026 |  | 2025
Pre-tax amounts: |  |  |
Unrealized pension actuarial gain on defined benefit pension plans | $ | 4,546 |  |  | $ | 3,336 |
Unrealized gain on available-for-sale debt security | — |  |  | 383 |
Foreign currency translation adjustment | 25,577 |  |  | 45,682 |
| $ | 30,123 |  |  | $ | 49,401 |
After-tax amounts: |  |  |
Unrealized pension actuarial gain on defined benefit pension plans | $ | 5,404 |  |  | $ | 4,470 |
Unrealized gain on available-for-sale debt security | — |  |  | 296 |
Foreign currency translation adjustment | 24,829 |  |  | 40,198 |
| $ | 30,233 |  |  | $ | 44,964 |
Schedule of Changes in Accumulated Other Comprehensive Income (Loss) | The following is a summary of the changes in accumulated other comprehensive income (loss), net of tax, for the three and nine months ended June 30, 2026:
| Three Months Ended June 30, 2026
(in thousands) | Defined Benefit Pension Plan |  | Unrealized Gain on Available-for-Sale Security |  | Foreign Currency Translation Adjustment |  | Total
Balance at beginning of period | $ | 5,404 |  |  | $ | — |  |  | $ | 38,092 |  |  | $ | 43,496 |
Activity during the period |  |  |  |  |  |  |
Other comprehensive loss before reclassifications | — |  |  | — |  |  | (13,263) |  |  | (13,263) |
Net current-period other comprehensive loss | — |  |  | — |  |  | (13,263) |  |  | (13,263) |
Balance at June 30, 2026 | $ | 5,404 |  |  | $ | — |  |  | $ | 24,829 |  |  | $ | 30,233 |
| Nine Months Ended June 30, 2026
(in thousands) | Defined Benefit Pension Plan |  | Unrealized Gain on Available-for-Sale Security |  | Foreign Currency Translation Adjustment |  | Total
Balance at beginning of period | $ | 4,470 |  |  | $ | 296 |  |  | $ | 40,198 |  |  | $ | 44,964 |
Activity during the period |  |  |  |  |  |  |
Other comprehensive loss before reclassifications | — |  |  | — |  |  | (15,369) |  |  | (15,369) |
Amounts reclassified from accumulated other comprehensive income (loss) | 934 |  |  | (296) |  |  | — |  |  | 638 |
Net current-period other comprehensive income (loss) | 934 |  |  | (296) |  |  | (15,369) |  |  | (14,731) |
Balance at June 30, 2026 | $ | 5,404 |  |  | $ | — |  |  | $ | 24,829 |  |  | $ | 30,233 |

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