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SHARE-BASED COMPENSATION (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
SHARE-BASED COMPENSATION
Non-vested shares	221,595		221,595
Selling, general and administrative expenses
SHARE-BASED COMPENSATION
Total share-based compensation cost	$ 2.2	$ 1.7	$ 6.4	$ 7.0
Total income tax benefit recognized	0.5	0.2	1.4	0.9
Performance-Accelerated Restricted Share (PARS) Awards
SHARE-BASED COMPENSATION
Pretax compensation expense	2.0	1.4	5.5	6.0
Compensation Plan for Non-Employee Directors
SHARE-BASED COMPENSATION
Pretax compensation expense	0.3	$ 0.3	0.9	$ 1.0
Total unrecognized compensation cost related to share-based compensation arrangements	$ 11.0		$ 11.0
Weighted average period			1 year 6 months

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