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Segment Information and Sales to Significant Customers - Summary Sales to Significant Customers (Detail) - Revenue [Member] - Customer Concentration Risk [Member] | 12 Months Ended
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Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2021
Customer 1 [Member] |  |  |
Percentage of revenue from significant customer | 23.80% | 26.80% | 25.00%
Customer 2 [Member] |  |  |
Percentage of revenue from significant customer | 23.10% | 20.10% | 19.10%

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