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Stock-Based Compensation - Additional Information (Detail) - USD ($)
$ in Thousands
12 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2023
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Net proceeds from issuance of common stock under incentive compensation and employee purchase plans $ 2,591 $ 2,641 $ 2,353
Selling, General, and Administrative Expenses [Member]      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Stock-based compensation expense, approximately $ 19,400 $ 24,000 $ 21,700