SHARE-BASED COMPENSATION (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Selling, general and administrative expenses
SHARE-BASED COMPENSATION
Total share-based compensation cost	$ 1.7	$ 1.9	$ 7.0	$ 5.3
Total income tax benefit recognized	0.2	0.4	0.9	1.0
Performance-Accelerated Restricted Share (PARS) Awards
SHARE-BASED COMPENSATION
Pretax compensation expense	$ 1.4	1.6	$ 6.0	4.4
Non-vested shares	196,648		196,648
Compensation Plan for Non-Employee Directors
SHARE-BASED COMPENSATION
Pretax compensation expense	$ 0.3	$ 0.3	$ 1.0	$ 0.9
Total unrecognized compensation cost related to share-based compensation arrangements	$ 10.7		$ 10.7
Weighted average period			1 year 9 months 18 days