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Schedule II - Valuation and Qualifying Accounts (Details) - USD ($)
$ in Thousands
 12 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2023
Valuation allowance - deferred tax assets      
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance at beginning of period $ 3,317 $ 3,254 $ 2,976
Charged to costs and expenses 0 63 278
Charged to Other Accounts 0 0 0
Deductions (263) 0 0
Balance at end of period 3,054 3,317 3,254
Reserve for future credit returns and pricing adjustments      
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance at beginning of period 3,121 1,311 1,131
Charged to costs and expenses 17,930 21,030 20,205
Charged to Other Accounts 0 0 0
Deductions 19,763 (19,220) (20,025)
Balance at end of period $ 1,288 $ 3,121 $ 1,311