REVENUE FROM CONTRACTS WITH CUSTOMERS - Remaining Performance Obligations (Details) $ in Millions	6 Months Ended
	Mar. 31, 2022 USD ($) month
Revenue from Contracts with Customers
Amount of remaining performance obligation	$ 727.7
Period of unsatisfied performance obligations represented in backlog contracts with month-to-month terms | month	1
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2022-04-01
Revenue from Contracts with Customers
Expected timing of satisfaction for remaining performance obligation	6 months
Amount of remaining performance obligation	$ 437.8
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	$ 226.4
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	$ 63.5