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Income Taxes - Additional Information (Details) - USD ($)
$ in Thousands
12 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2022
Income Taxes [Line Items]        
Foreign pretax earnings $ 144,500 $ 150,800 $ 172,700  
Current foreign tax expense related to foreign tax withholdings 15,600 14,600 12,300  
Unremitted earnings of foreign subsidiaries 94,600      
Deferred tax liabilities, undistributed foreign earnings 3,200      
Unrecognized tax benefits 19,505 $ 19,879 $ 13,849 $ 12,980
Unrecognized tax benefits that would impact the effective tax rate if recognized 18,000      
Unrecognized tax benefits, accrued interest 1,900      
U.S. Federal        
Income Taxes [Line Items]        
Net operating loss carryforwards 1,300      
California Franchise Tax Board | Research Tax Credit Carryforward        
Income Taxes [Line Items]        
Excess state research credit $ 6,600