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POST EMPLOYMENT BENEFITS - Pension Funding and Payments and Defined Contribution Plans (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2023
Retirement Benefits [Abstract]
Employer contributions	$ 0	$ 0
Expected contributions to be made within twelve months	0
Defined contribution benefit expense	1,745	$ 2,807	$ 4,596
Projected Benefit Payments
2026	1,262
2027	954
2028	1,023
2029	1,032
2030	977
Thereafter	5,148
Total	$ 10,396

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