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Stockholders' Equity And Stock-Based Compensation Stockholders' Equity And Stock- Based Compensation - Dividends Declared (Details) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Oct. 24, 2018
Jul. 24, 2018
Apr. 24, 2018
Jan. 24, 2018
Sep. 28, 2018
Sep. 29, 2017
Sep. 30, 2016
Dividends Payable [Line Items]              
Cash dividend declared per common share   $ 0.16 $ 0.16 $ 0.16 $ 0.67 $ 0.58 $ 0.50
Dividends   $ 16.6 $ 16.7 $ 16.6      
Subsequent Event [Member]              
Dividends Payable [Line Items]              
Cash dividend declared per common share $ 0.19            
Dividends $ 19.6