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ASSOCIATE MEDICAL BENEFITS - Retiree Medical Plan for Domestic Associates (Details) - USD ($)
$ in Millions
 12 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Amounts recognized in the Consolidated Balance Sheets consist of:    
Non-current liabilities $ (76.7) $ (82.1)
Postretirement Medical Benefits | U.S. Plan    
Change in projected benefit obligation:    
Benefit obligation at beginning of year 15.7 20.1
Service cost 0.1 0.2
Interest cost 0.8 0.5
Plan participants’ contributions 0.4 0.4
Actuarial gain (2.2) (4.0)
Curtailment loss 0.0 0.6
Benefits paid (1.5) (2.1)
Projected benefit obligation (“PBO”) at end of year 13.3 15.7
Change in plan assets:    
Fair value of plan assets at beginning of year 0.0 0.0
Employer contribution 1.1 1.7
Plan participants’ contributions 0.4 0.4
Gross benefits paid (1.5) (2.1)
Fair value of plan assets at end of year 0.0 0.0
Unfunded status at end of year (13.3) (15.7)
Amounts recognized in the Consolidated Balance Sheets consist of:    
Current liabilities (1.4) (1.6)
Non-current liabilities (11.9) (14.1)
Total amount accrued (13.3) (15.7)
Amounts recognized in AOCL consist of:    
Actuarial loss (3.4) (1.2)
Prior service credit 0.0 (0.2)
Total amount recognized (3.4) (1.4)
Total change in other comprehensive loss attributable to:    
Gain during the period 2.2 3.4
Reclassification to net earnings (0.2) (0.9)
Total change in other comprehensive loss $ 2.0 $ 2.5
Discount rate used in development of APBO 5.98% 5.60%