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REVENUE - TIMING OF REVENUE RECOGNITION (Details) - USD ($)
$ in Thousands
 3 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Timing of Revenue Recognition [Roll Forward]    
Billed, beginning $ 222,297  
Customers' credit, beginning 33,246 $ 32,586
Increase (decrease) for customers' credits 7,724 6,080
Billed, end 370,965  
Customers' credit, end 40,970 38,666
Billed    
Timing of Revenue Recognition [Roll Forward]    
Billed, beginning 222,297 212,838
Increase for customer accounts receivable 148,668 53,977
Billed, end 370,965 266,815
Unbilled    
Timing of Revenue Recognition [Roll Forward]    
Billed, beginning 13,769 10,351
Increase for customer accounts receivable 95,378 62,598
Billed, end $ 109,147 $ 72,949