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REVENUE FROM CONTRACTS WITH CLIENTS - Activity in Allowance for Credit Losses (Details) - USD ($)
$ in Thousands
12 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2023
Allowance for doubtful accounts, rollforward      
Opening balance $ 6,931 $ 7,446 $ 6,268
Charged to expense (492) 58 1,271
Uncollectible invoices written off (42) (823) (107)
Amounts collected 0 250 14
Ending balance $ 6,397 $ 6,931 $ 7,446