SHARE-BASED COMPENSATION (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Selling, general and administrative expenses
SHARE-BASED COMPENSATION
Total share-based compensation cost	$ 2.8	$ 1.3	$ 5.5	$ 4.2
Performance-Accelerated Restricted Share Awards
SHARE-BASED COMPENSATION
Pretax compensation expense	$ 2.5	1.0	$ 4.5	3.2
Non-vested shares	229,602		229,602
Non-Employee Directors Plan
SHARE-BASED COMPENSATION
Pretax compensation expense	$ 0.3	0.3	$ 1.0	1.0
Total income tax benefit recognized	0.4	$ 0.2	1.1	$ 0.9
Total unrecognized compensation cost related to share-based compensation arrangements	$ 9.2		$ 9.2
Remaining weighted-average period for recognition of total unrecognized compensation cost			1 year 10 months 24 days

Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

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