SHARE-BASED COMPENSATION (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
SHARE-BASED COMPENSATION
Total unrecognized compensation cost related to share-based compensation arrangements	$ 12.9		$ 12.9
Selling, general and administrative expenses
SHARE-BASED COMPENSATION
Total share-based compensation cost	1.9	$ 2.8	5.3	$ 5.5
Performance-Accelerated Restricted Share Awards
SHARE-BASED COMPENSATION
Pretax compensation expense	$ 1.6	2.5	$ 4.4	4.5
Non-vested shares	265,643		265,643
Compensation Plan for Non-Employee Directors
SHARE-BASED COMPENSATION
Pretax compensation expense	$ 0.3	0.3	$ 0.9	1.0
Total income tax benefit recognized	$ 0.4	$ 0.4	$ 1.0	$ 1.1
Vesting period			1 year 10 months 24 days

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

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (h)(1)(i)
-URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901

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Amount of cost capitalized for award under share-based payment arrangement.

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-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
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Amount of cost not yet recognized for nonvested award under share-based payment arrangement.

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-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
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Amount of tax benefit for recognition of expense of award under share-based payment arrangement.

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Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition.

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Number of non-vested options outstanding.

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