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Basis of Presentation (Details) - USD ($)
$ in Millions
3 Months Ended
Dec. 31, 2016
Dec. 30, 2017
Oct. 01, 2017
Accounting Standards Update 2016-09 [Member]      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Windfall Tax Deductions Not Yet Recognized     $ 37.0
Excess Tax Benefit from Share-based Compensation, Operating Activities $ 0.1    
Excess tax benefits realized from stock-based awards $ 0.1    
forfeiture adjustment     $ 0.7
Accounting Standards Update 2016-16 [Member]      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Deferred Tax Assets, Other   $ 77.0