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Share-based Compensation Expense - Summary of Assumptions used to Estimate the Weighted-Average Fair Value Per Share for Stock Purchase under the Employee Stock Purchase Plan (Details) - Employee Stock
6 Months Ended
Jul. 01, 2018
$ / shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Expected volatility, minimum 29.00%
Expected volatility, maximum 39.00%
Expected dividends 0.00%
Weighted-average fair value per share (in dollars per share) $ 58.09
Minimum  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Risk-free interest rate 1.22%
Expected term 6 months
Maximum  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Risk-free interest rate 1.89%
Expected term 1 year