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Investments - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Dec. 29, 2019
Dec. 30, 2018
Dec. 29, 2019
Dec. 30, 2018
Investments, Debt and Equity Securities [Abstract]        
Realized gain (loss) on sale of investments $ 0.1 $ (0.1) $ 0.1 $ (0.1)