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Enterprise-wide Disclosures and Concentration of Business - Additional Information (Detail) - Net Operating Revenue	12 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2021
Customer Concentration Risk | Customer One
Concentration Risk [Line Items]
Concentration risk, percentage	11.00%	10.00%	11.00%
U.S. | Geographic Concentration Risk
Concentration Risk [Line Items]
Concentration risk, percentage	43.00%	44.00%	46.00%

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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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.

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