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Organization and Significant Accounting Policies - 401(k) Plans, Additional Information (Details) - USD ($) shares in Thousands, $ in Millions | 12 Months Ended
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Sep. 26, 2020 | Sep. 28, 2019 | Sep. 29, 2018
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items] |  |  |
Employees benefit plan | $ 6.4 | $ 4.2 | $ 2.3
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) | 218 | 161 | 61

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- Definition Amount of discretionary contributions made by an employer to a defined contribution plan. + References No definition available. + Details
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- Definition Number of shares issued during the period to an employee benefit plan, such as a defined contribution or defined benefit plan. + References No definition available. + Details
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- Details
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