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Segment Information and Sales to Significant Customers - Summary Sales to Significant Customers (Parenthetical) (Detail)			12 Months Ended
		Apr. 01, 2020	Sep. 30, 2021	Sep. 30, 2020
Concentration risk, Customer		Starting April 1, 2020, following the merger of two significant customers, their respective revenue was consolidated.
Revenue [Member] | Customer two concentration risk [Member]
Percentage of revenue from significant customer	[1]		19.10%	12.10%
Revenue [Member] | Customer two concentration risk [Member] | Significant customers group [Member]
Percentage of revenue from significant customer			10.00%	10.00%
[1] Starting April 1, 2020, following the merger of two significant customers, their respective revenue was consolidated.

X

- Definition

Description of risks that arise due to the volume of business transacted with a particular customer. At a minimum, the description informs financial statement users of the general nature of the risk, but excludes "Information about Major Customers" that may be disclosed elsewhere (for instance, segment disclosures).

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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.

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