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ASSOCIATE MEDICAL BENEFITS - Additional Information (Details) $ in Millions	12 Months Ended
	Sep. 30, 2025 USD ($) Year	Sep. 30, 2024 USD ($)	Sep. 30, 2023 USD ($)
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Self-insurance per occurrence	$ 1.0
Benefits cost recognized	$ 45.4	$ 42.5	$ 40.1
Health care cost trend rate (percent)	7.50%
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)	$ 0.7	$ 0.3	$ 0.7

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Postretirement Benefits Medical Coverage, Annual Limit

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Amount of net periodic benefit cost (credit) for defined benefit plan.

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