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ASSOCIATE MEDICAL BENEFITS - Additional Information (Details) $ in Millions	12 Months Ended
	Sep. 30, 2023 USD ($) Year	Sep. 30, 2022 USD ($)	Sep. 30, 2021 USD ($)
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Self-insurance per occurrence	$ 1.0
Benefits cost recognized	$ 40.1	$ 46.6	$ 43.7
Health care cost trend rate (percent)	7.00%
Ultimate trend rate (percent)	5.00%
U.S. Plan | Postretirement Medical Benefits
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Minimum retirement age (in years) | Year	55
Number of years of service (in years)	10 years
Net periodic benefit (income)	$ 0.7	$ (0.2)	$ (0.2)

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- Definition

Postretirement Benefits Medical Coverage, Annual Limit

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+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 715
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
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Amount of net periodic benefit cost (credit) for defined benefit plan.

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-Topic 715
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Ultimate trend rate for health care cost for defined benefit postretirement plan.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Amount of cost (reversal of cost) for other postretirement benefits. Excludes pension benefits.

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