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Stock-Based Compensation - Stock Option Activity (Details)
$ / shares in Units, $ in Thousands
 6 Months Ended
Jun. 29, 2018
USD ($)
$ / shares
shares
Shares  
Options outstanding at beginning of period (in shares) | shares 22,208,446
Granted (in shares) | shares 818,842
Exercised (in shares) | shares (1,141,640)
Forfeited (in shares) | shares (102,177)
Options outstanding at end of period (in shares) | shares 21,783,471
Exercisable at end of period (in shares) | shares 16,249,965
Weighted Average Exercise Price Per Share  
Options outstanding at beginning of period (in dollars per share) | $ / shares $ 6.83
Granted (in dollars per share) | $ / shares 22.63
Exercised (in dollars per share) | $ / shares 5.74
Forfeited (in dollars per share) | $ / shares 15.20
Options outstanding at end of period (in dollars per share) | $ / shares 7.44
Exercisable at end of period (in dollars per share) | $ / shares $ 4.80
Weighted Average Remaining Contractual Term  
Options outstanding at end of period 3 years 9 months 3 days
Exercisable at end of period 3 years 2 months 8 days
Aggregate Intrinsic Value  
Options outstanding at end of period | $ $ 312,900
Exercisable at end of period | $ $ 271,709