Organization and Significant Accounting Policies - 401(k) Plans, Additional Information (Details) - USD ($) shares in Thousands, $ in Millions	12 Months Ended
Sep. 30, 2023	Sep. 24, 2022	Sep. 25, 2021
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items]
Employees benefit plan	$ 7.9	$ 7.2	$ 6.8
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)	216	170	159

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No definition available.

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