Annual report pursuant to Section 13 and 15(d)

Organization and Significant Accounting Policies - 401(k) Plans, Additional Information (Details)

v3.20.2
Organization and Significant Accounting Policies - 401(k) Plans, Additional Information (Details) - USD ($)
shares in Thousands, $ in Millions
12 Months Ended
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