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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Schedule of Comprehensive Income (Details) - USD ($) $ in Thousands | 12 Months Ended
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Sep. 30, 2025 | Sep. 30, 2024
Before Tax Amount [Member] |  |  |
Unrealized holding gain arising during period on: |  |  |
Available-for-sale investments |  | $ 398 | $ 834
Defined benefit pension plan |  | 122 | 297
Total unrealized holding gain arising during period |  | 520 | 1,131
Reclassification of pension costs |  | 11 | 53
Other comprehensive income, net |  | 531 | 1,184
Tax Expense [Member] |  |  |
Unrealized holding gain arising during period on: |  |  |
Available-for-sale investments | [1] | (98) | (205)
Defined benefit pension plan | [1] | (37) | (91)
Total unrealized holding gain arising during period | [1] | (135) | (296)
Reclassification of pension costs | [1] | (3) | (15)
Other comprehensive income, net | [1] | (138) | (311)
Net of Tax Amount [Member] |  |  |
Unrealized holding gain arising during period on: |  |  |
Available-for-sale investments |  | 300 | 629
Defined benefit pension plan |  | 85 | 206
Total unrealized holding gain arising during period |  | 385 | 835
Reclassification of pension costs |  | 8 | 38
Other comprehensive income, net |  | $ 393 | $ 873
[1] | Related income tax expense or benefit calculated using an income tax rate approximating 25% for available-for-sale investments and 28% for pension plan.

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