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Segment Information and Revenue from Significant Customers - Summary Sales to Significant Customers (Detail) - Revenue [Member] - Customer Concentration Risk [Member]	12 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2023
Customer 1 [Member]
Revenue, Major Customer [Line Items]
Percentage of revenue from significant customer	25.90%	24.50%	23.80%
Customer 2 [Member]
Revenue, Major Customer [Line Items]
Percentage of revenue from significant customer	19.90%	22.60%	23.10%

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- Definition

Concentration Risk Threshold Percentage

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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.

+ References

No definition available.

+ Details

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- Details

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- Details

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- Details

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