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Postretirement Benefit Plans - Additional Information (Details) - Pension - U.S. - USD ($)
3 Months Ended 6 Months Ended 9 Months Ended 12 Months Ended
Jul. 03, 2020
Sep. 27, 2019
Jul. 03, 2020
Apr. 03, 2020
Jun. 29, 2018
Jun. 30, 2017
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]            
Qualified employer contribution $ 0 $ 302,000,000 $ 0 $ 0 $ 700,000,000 $ 700,000,000
Expected employer contribution $ 0   $ 0