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ASSOCIATE MEDICAL BENEFITS - Retiree Medical Plan for Domestic Associates (Details) - USD ($)
$ in Millions
 12 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Amounts recognized in the Consolidated Balance Sheets consist of:    
Non-current liabilities $ (73.0) $ (76.7)
Postretirement Medical Benefits | U.S. Plan    
Change in projected benefit obligation:    
Benefit obligation at beginning of year 13.3 15.7
Service cost 0.1 0.1
Interest cost 0.8 0.8
Plan participants’ contributions 0.3 0.4
Actuarial (gain) loss 1.5 (2.2)
Benefits paid (2.2) (1.5)
Projected benefit obligation (“PBO”) at end of year 13.8 13.3
Change in plan assets:    
Fair value of plan assets at beginning of year 0.0 0.0
Employer contribution 1.9 1.1
Plan participants’ contributions 0.3 0.4
Gross benefits paid (2.2) (1.5)
Fair value of plan assets at end of year 0.0 0.0
Overfunded (underfunded) status at end of year (13.8) (13.3)
Amounts recognized in the Consolidated Balance Sheets consist of:    
Current liabilities (1.3) (1.4)
Non-current liabilities (12.5) (11.9)
Total amount accrued (13.8) (13.3)
Amounts recognized in AOCL consist of:    
Actuarial gain (1.3) (3.4)
Total amount recognized (1.3) (3.4)
Total change in other comprehensive income attributable to:    
Gain (loss) during the period (1.5) 2.2
Reclassification to net earnings (0.6) (0.2)
Total change in other comprehensive income $ (2.1) $ 2.0
Discount rate used in development of APBO 4.86% 5.98%