SHARE-BASED COMPENSATION (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2020	Mar. 31, 2019
Selling, general and administrative expenses
SHARE-BASED COMPENSATION
Total share-based compensation cost	$ 1.5	$ 1.2	$ 2.9	$ 2.6
Performance-Accelerated Restricted Share Awards
SHARE-BASED COMPENSATION
Pretax compensation expense	$ 1.1	0.9	$ 2.3	2.0
Non-vested shares	175,577		175,577
Non-Employee Directors Plan
SHARE-BASED COMPENSATION
Pretax compensation expense	$ 0.3	0.3	$ 0.6	0.5
Total income tax benefit recognized	0.3	$ 0.3	0.7	$ 0.6
Total unrecognized compensation cost related to share-based compensation arrangements	$ 6.8		$ 6.8
Remaining weighted-average period for recognition of total unrecognized compensation cost	2 years 1 month 6 days

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

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