REVENUE FROM CONTRACTS WITH CUSTOMERS - Remaining Performance Obligations (Details) $ in Millions	9 Months Ended
	Jun. 30, 2022 USD ($) month
Revenue from Contracts with Customers
Amount of remaining performance obligation	$ 862.2
Period of unsatisfied performance obligations represented in backlog contracts with month-to-month terms (in months) | month	1
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2022-07-01
Revenue from Contracts with Customers
Expected timing of satisfaction for remaining performance obligation	3 months
Amount of remaining performance obligation	$ 338.7
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2022-10-01
Revenue from Contracts with Customers
Expected timing of satisfaction for remaining performance obligation	12 months
Amount of remaining performance obligation	$ 408.6
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2023-10-01
Revenue from Contracts with Customers
Expected timing of satisfaction for remaining performance obligation	12 months
Amount of remaining performance obligation	$ 114.9