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Shareholder's Equity (Narrative) (Details) - USD ($)
 3 Months Ended 9 Months Ended
Feb. 24, 2020
Nov. 18, 2019
Jul. 24, 2018
Jun. 28, 2020
Mar. 29, 2020
Dec. 29, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Jun. 28, 2020
Jun. 30, 2019
Subsidiary, Sale of Stock [Line Items]                      
Common stock repurchase program, approved amount     $ 1,000,000,000                
Common stock repurchase program, authorization period     36 months                
Shares repurchased       0     0     6,200,000 4,900,000
Repuchase amount, fair value         $ 149,200,000 $ 90,600,000   $ 250,000,000.0 $ 18,500,000 $ 364,600,000 $ 268,500,000
Average cost per share (in dollars per share)                   $ 58.57 $ 54.34
ASR                      
Subsidiary, Sale of Stock [Line Items]                      
Repuchase payment   $ 125,000,000                  
Shares repurchased 300,000 1,700,000               2,000,000.0  
Percentage of total shares   85.00%                  
Repuchase amount, fair value $ 18,500,000 $ 106,300,000               $ 124,800,000  
Reduction to additional paid-in capital   $ 18,700,000                  
Average cost per share (in dollars per share)                   $ 61.47  
ASR | Average                      
Subsidiary, Sale of Stock [Line Items]                      
Shares repurchased 2,000,000.0                    
Average cost per share (in dollars per share) $ 61.59