STOCK INCENTIVE PLAN - Narrative (Details) - USD ($) $ in Thousands, shares in Millions		12 Months Ended
	Nov. 21, 2019	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2023
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense		$ 23,561	$ 20,300	$ 21,101
Employee service share-based compensation, tax benefit from compensation expense		3,011	1,619	2,706
Selling, General and Administrative Expenses
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense		$ 23,561	$ 20,300	$ 21,101
2020 Omnibus Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock reserved for future issuance (in shares)	1.4
Life of awards	10 years