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Shareholders Deficit - Stock-based Compensation (Details) - USD ($)
$ / shares in Units, shares in Millions
3 Months Ended 6 Months Ended
Dec. 26, 2018
Dec. 26, 2018
Dec. 27, 2017
Stock-based Compensation [Line Items]      
Stock options granted   0.7 1.2
Weighted average exercise price per share   $ 43.63 $ 31.22
Weighted average fair value per share   $ 8.25 $ 4.45
Restricted share awards granted   0.3 0.4
Weighted average fair value per share   $ 43.35 $ 31.23
Modification of Stock-based Compensation Award [Member] | Stock Options With a Performance Condition [Member]      
Stock-based Compensation [Line Items]      
Incremental compensation cost resulting from modification   $ 0  
Modification of Stock-based Compensation Award [Member] | Fiscal 2018 [Member] | Stock Options With a Performance Condition [Member]      
Stock-based Compensation [Line Items]      
Stock options forfeited 0.2    
Modification of Stock-based Compensation Award [Member] | Fiscal 2019 [Member] | Stock Options With a Performance Condition [Member]      
Stock-based Compensation [Line Items]      
Stock options granted 0.4