GOODWILL AND INTANGIBLE ASSETS - Amortization of intangible assets (Details) - USD ($) $ in Thousands	Sep. 30, 2024	Sep. 30, 2023
Estimated amortization expense for intangible assets for each of the next five fiscal years is expected to be as follows
2025	$ 34,825
2026	34,606
2027	34,178
2028	34,029
2029	32,892
Thereafter	103,866
Totals	$ 274,396	$ 308,428
Weighted Average
Estimated amortization expense for intangible assets for each of the next five fiscal years is expected to be as follows
RUL1 (in years)	8 years 4 months 24 days
Customer relationships
Estimated amortization expense for intangible assets for each of the next five fiscal years is expected to be as follows
2025	$ 27,842
2026	27,780
2027	27,595
2028	27,461
2029	26,324
Thereafter	97,987
Totals	$ 234,989	262,109
Customer relationships | Weighted Average
Estimated amortization expense for intangible assets for each of the next five fiscal years is expected to be as follows
RUL1 (in years)	9 years
Intellectual property
Estimated amortization expense for intangible assets for each of the next five fiscal years is expected to be as follows
2025	$ 6,459
2026	6,459
2027	6,459
2028	6,459
2029	6,459
Thereafter	5,429
Totals	$ 37,724	44,103
Intellectual property | Weighted Average
Estimated amortization expense for intangible assets for each of the next five fiscal years is expected to be as follows
RUL1 (in years)	5 years 10 months 24 days
Other
Estimated amortization expense for intangible assets for each of the next five fiscal years is expected to be as follows
2025	$ 524
2026	367
2027	124
2028	109
2029	109
Thereafter	450
Totals	$ 1,683	$ 2,216
Other | Weighted Average
Estimated amortization expense for intangible assets for each of the next five fiscal years is expected to be as follows
RUL1 (in years)	6 years 2 months 12 days