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POST EMPLOYMENT BENEFITS - Fair value of total plan assets by asset category (Details) - USD ($) $ in Thousands	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2023
Fair value of total plan assets by asset category
Total	$ 16,988	$ 18,687	$ 15,993
Cash
Fair value of total plan assets by asset category
Total	1,875	432
Investment grade corporate bonds
Fair value of total plan assets by asset category
Total	8,490	9,300
Government bonds
Fair value of total plan assets by asset category
Total	6,623	7,360
Multi-asset fund
Fair value of total plan assets by asset category
Total		1,595
Level 1
Fair value of total plan assets by asset category
Total	257	432
Level 1 | Cash
Fair value of total plan assets by asset category
Total	257	432
Level 1 | Investment grade corporate bonds
Fair value of total plan assets by asset category
Total	0	0
Level 1 | Government bonds
Fair value of total plan assets by asset category
Total	0	0
Level 1 | Multi-asset fund
Fair value of total plan assets by asset category
Total		0
Level 2
Fair value of total plan assets by asset category
Total	16,731	18,255
Level 2 | Cash
Fair value of total plan assets by asset category
Total	1,618	0
Level 2 | Investment grade corporate bonds
Fair value of total plan assets by asset category
Total	8,490	9,300
Level 2 | Government bonds
Fair value of total plan assets by asset category
Total	6,623	7,360
Level 2 | Multi-asset fund
Fair value of total plan assets by asset category
Total		1,595
Level 3
Fair value of total plan assets by asset category
Total	0	0
Level 3 | Cash
Fair value of total plan assets by asset category
Total	0	0
Level 3 | Investment grade corporate bonds
Fair value of total plan assets by asset category
Total	0	0
Level 3 | Government bonds
Fair value of total plan assets by asset category
Total	$ 0	0
Level 3 | Multi-asset fund
Fair value of total plan assets by asset category
Total

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Amount of asset segregated and restricted to provide benefit under defined benefit plan. Asset includes, but is not limited to, stock, bond, other investment, earning from investment, and contribution by employer and employee.

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