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REVENUE (Tables)
 12 Months Ended
Sep. 30, 2024
Revenue from Contract with Customer [Abstract]  
Summary of Rebate Activity The rebate activity was as follows (in thousands).
As of September 30,
202420232022
Beginning balance$66,958 $56,542 $47,648 
Rebate expense118,320 106,762 88,057 
Rebate payments(110,482)(96,346)(79,163)
Ending balance$74,796 $66,958 $56,542