PENSION PLANS AND OTHER BENEFITS - Schedule of Changes in Other Comprehensive Loss (Income) (Details) - Pension Plan - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2025	Sep. 30, 2024
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Net loss (gain) arising during the period	$ 1.0	$ (0.1)
Amortization of net loss	(1.1)	(1.4)
Amortization of prior service credit	0.1	0.1
Allocated tax expense	0.2	0.4
Currency fluctuation adjustment	(0.1)	(0.7)
Total recognized in other comprehensive loss (income)	0.1	(1.7)
Net periodic benefit cost	0.9	1.3
Total recognized in net periodic benefit cost and other comprehensive loss (income)	$ 1.0	$ (0.4)