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Business Combination (Narrative) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 30, 2014
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2015
Business Acquisition [Line Items]        
Acquisitions, less cash acquired   $ 8.2 $ 0.0 $ 34.5
Gain on previously held equity interest   $ 0.0 $ 0.0 17.9
Production Joint Venture        
Business Acquisition [Line Items]        
Acquisitions, less cash acquired $ 22.6      
Percent ownership before acquisition 50.00%      
Percent ownership after acquisition 100.00%      
Gain on previously held equity interest       $ 17.9