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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
	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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- Definition

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
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-Name Accounting Standards Codification
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-Paragraph 42
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Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
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