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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Schedule of Comprehensive Income (Details) - USD ($)
$ in Thousands
 12 Months Ended
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.