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Loss Per Share - Narrative (Details) - shares
shares in Millions
12 Months Ended
Jun. 28, 2020
Jun. 30, 2019
Jun. 24, 2018
Common Stock      
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]      
Anti-dilutive potential common shares excluded from diluted earnings per share calculation (shares) 5.4 9.0 11.3