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Income Taxes - (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2017
Oct. 01, 2016
Sep. 30, 2017
Oct. 01, 2016
Changes in the balances of gross unrecognized tax benefits        
Effective tax rate (as a percent) 41.70% 37.70% 38.00% 34.30%
Tax benefit related to stock-based compensation $ 0.1   $ 0.4