REVENUE - TIMING OF REVENUE RECOGNITION (Details) - USD ($) $ in Thousands	3 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Timing of Revenue Recognition [Roll Forward]
Customers' credit, beginning	$ 38,595	$ 44,910
Increase for customers' credits	3,992	551
Customers' credit, end	42,587	45,461
Billed
Timing of Revenue Recognition [Roll Forward]
Billed, beginning	105,531	97,540
Increase for customer accounts receivable	105,505	72,932
Billed, end	211,036	170,472
Unbilled
Timing of Revenue Recognition [Roll Forward]
Billed, beginning	20,094	19,100
Increase for customer accounts receivable	97,186	72,831
Billed, end	$ 117,280	$ 91,931