Quarterly report pursuant to Section 13 or 15(d)

Income Taxes (Details)

v3.8.0.1
Income Taxes (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Dec. 30, 2017
Dec. 31, 2016
Sep. 30, 2018
Sep. 30, 2017
Income Tax Contingency [Line Items]        
Recognized provisional amount $ 10.6      
Effective income tax rate reconciliation, excluding the rate change, percentage 46.40%      
Effective income tax rate (percent)   27.00%   5.90%
Effective income tax rate reconciliation, at federal statutory income tax rate, percent 24.30%      
Provisional amount of expense related to the remeasurement of deferred tax balance $ 1.1      
Provisional amount related to this one-time transition tax $ 9.5      
Minimum | Forecast        
Income Tax Contingency [Line Items]        
Effective income tax rate reconciliation, at federal statutory income tax rate, percent     12.00%  
Maximum | Forecast        
Income Tax Contingency [Line Items]        
Effective income tax rate reconciliation, at federal statutory income tax rate, percent     13.00%