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Stockholders' Equity (Narrative) (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
3 Months Ended 4 Months Ended 6 Months Ended
Apr. 15, 2018
Apr. 16, 2017
Jan. 21, 2018
Apr. 15, 2018
Apr. 16, 2017
Equity, Class of Treasury Stock [Line Items]          
Treasury Stock, Shares, Acquired       1.1  
Treasury Stock, Value, Acquired, Cost Method       $ 100.0  
Cash dividends declared per common share $ 0.4 $ 0.40 $ 0.40 $ 0.80 $ 0.80
Dividends, common stock       $ 23.5  
Expiration: November 2018          
Equity, Class of Treasury Stock [Line Items]          
Repurchase of common stock, remaining authorized amount $ 81.0     $ 81.0