PENSION PLANS - Discount Rates (Details)	Dec. 31, 2019	Sep. 30, 2019
Supplemental defined benefit pension plan
Defined Benefit Plan Disclosure [Line Items]
Supplemental defined benefit pension plan		3.23%
Subsequent Event | U.S. qualified defined benefit pension plan | United States
Defined Benefit Plan Disclosure [Line Items]
Supplemental defined benefit pension plan	3.34%
Subsequent Event | Supplemental defined benefit pension plan
Defined Benefit Plan Disclosure [Line Items]
Supplemental defined benefit pension plan	3.35%