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LEASES - Narrative (Details)
$ in Millions
3 Months Ended 12 Months Ended
Sep. 30, 2023
USD ($)
renewal_option
Sep. 30, 2023
USD ($)
extension
renewal_option
Sep. 30, 2022
USD ($)
Sep. 30, 2021
USD ($)
Lessee, Lease, Description [Line Items]        
Operating lease expense | $   $ 12.4 $ 11.2 $ 17.3
Right-of-use assets and lease liability | $ $ 17.6      
Initial lease term not yet commenced 12 years 12 years    
Number of lease extensions | extension   2    
Term of extension   5 years    
Tulsa Corporate Office Lease        
Lessee, Lease, Description [Line Items]        
Number of renewal options | renewal_option 2 2    
Renewal option term 5 years 5 years    
Tulsa Industrial Facility Lease        
Lessee, Lease, Description [Line Items]        
Number of renewal options | renewal_option 2 2    
Renewal option term 2 years 2 years