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Segment Information and Sales to Significant Customers - Summary Sales to Significant Customers (Detail) - Revenue [Member]		12 Months Ended
		Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2019
Customer 1
Percentage of revenue from significant customer		25.00%	25.80%	23.40%
Customer 2
Percentage of revenue from significant customer	[1]	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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