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Revenue - Revenue by Geographic Region (Detail) - Revenue [Member] - Geographic Concentration Risk [Member]
12 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2022
Domestic [Member]      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Percentage of revenue 83.00% 82.00% 74.00%
Foreign [Member]      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Percentage of revenue 17.00% 18.00% 26.00%