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Revenue - Additional Information (Detail) - USD ($)
$ in Thousands
12 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2024-09-30    
Revenue [Line Items]    
Deferred revenue recognized   $ 157,681
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2025-09-30    
Revenue [Line Items]    
Deferred revenue recognized $ 99,957  
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2025-10-01    
Revenue [Line Items]    
Unsatisfied remaining performance obligations $ 6,400,000  
Remaining performance obligation, expected timing of recognized 3 years