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Organization and Significant Accounting Policies - 401(k) Plans, Additional Information (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 27, 2025	Sep. 28, 2024	Sep. 30, 2023
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items]
Employees benefit plan	$ 7.7	$ 6.8	$ 7.9
Class A common stock
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items]
401(k) matching contributions made in Class A common stock (in shares)	240,328	198,697	216,000

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Amount of discretionary contributions made by an employer to a defined contribution plan.

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Number of shares issued during the period to an employee benefit plan, such as a defined contribution or defined benefit plan.

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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 505
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481112/505-10-50-2

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