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ASSOCIATE MEDICAL BENEFITS - Additional Information (Details) $ in Millions | 12 Months Ended
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Sep. 30, 2024 USD ($) Year | Sep. 30, 2023 USD ($) | Sep. 30, 2022 USD ($)
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Self-insurance per occurrence | $ 1.0 |  |
Benefits cost recognized | $ 42.5 | $ 40.1 | $ 46.6
Health care cost trend rate (percent) | 6.50% |  |
Ultimate trend rate (percent) | 4.50% |  |
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) | $ 0.3 | $ 0.7 | $ (0.2)

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- Definition Assumed rate, for next fiscal year, based on annual change in cost of health care cost benefits used to measure expected cost of benefits covered by defined benefit postretirement plan. Factors include, but are not limited to, estimate of health care inflation, change in health care utilization or delivery pattern, technological advances, and change in health status of participant. Excludes factors for change in composition of plan population by age and dependency status. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (l) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 + Details
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