SHARE-BASED COMPENSATION (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2021	Mar. 31, 2020
Selling, general and administrative expenses
SHARE-BASED COMPENSATION
Total share-based compensation cost	$ 1.4	$ 1.5	$ 2.7	$ 2.9
Performance-Accelerated Restricted Share Awards
SHARE-BASED COMPENSATION
Pretax compensation expense	$ 1.1	1.1	$ 2.1	2.3
Non-vested shares	220,430		220,430
Non-Employee Directors Plan
SHARE-BASED COMPENSATION
Pretax compensation expense	$ 0.3	0.3	$ 0.6	0.6
Total income tax benefit recognized	0.3	$ 0.3	0.7	$ 0.7
Total unrecognized compensation cost related to share-based compensation arrangements	$ 6.1		$ 6.1
Remaining weighted-average period for recognition of total unrecognized compensation cost			1 year 6 months

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

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