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Segment Information and Sales to Significant Customers - Summary Sales to Significant Customers (Detail) - Revenue [Member] | 12 Months Ended
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Sep. 30, 2022 | Sep. 30, 2021 | Sep. 30, 2020
Customer 1 |  |  |  |
Percentage of revenue from significant customer |  | 26.80% | 25.00% | 25.80%
Customer 2 |  |  |  |
Percentage of revenue from significant customer | [1] | 20.10% | 19.10% | 12.10%
[1] | Starting April 1, 2020, following the merger of two significant customers, their respective revenue was consolidated.

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