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ASSOCIATE MEDICAL BENEFITS - Additional Information (Details) $ in Millions	12 Months Ended
	Sep. 30, 2021 USD ($) Year	Sep. 30, 2020 USD ($)	Sep. 30, 2019 USD ($)
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Self-insurance per occurrence	$ 0.7
Benefits cost recognized	$ 43.7	$ 34.2	$ 31.4
Health care cost trend rate (percent)	5.75%
Ultimate trend rate (percent)	4.75%
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)	$ (0.2)	$ (0.1)	$ (0.1)

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