Stockholders' Equity (Stock Option Activity) (Details) (USD $) In Thousands, except Share data, unless otherwise specified	6 Months Ended	12 Months Ended
	Jun. 29, 2014	Dec. 29, 2013
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Outstanding, Beginning Balance (in shares)	13,938,487
Granted (in shares)	521,650
Exercised (in shares)	(1,454,437)
Canceled (in shares)	(4,147)
Forfeited (in shares)	(266,111)
Outstanding, Ending Balance (in shares)	12,735,442	13,938,487
Vested and expected to vest (in shares)	12,445,248
Exercisable (in shares)	9,005,173
Share-based Compensation Arrangement by Share-based Payment Award, Options, Weighted Average Exercise Price [Abstract]
Weighted Average Exercise Price, Outstanding, Beginning Balance (in dollars per share)	$ 7.40
Weighted Average Exercise Price, Granted (in dollars per share)	$ 42.60
Weighted Average Exercise Price, Exercised (in dollars per share)	$ 1.05
Weighted Average Exercise Price, Canceled (in dollars per share)	$ 6.89
Weighted Average Exercise Price, Forfeited (in dollars per share)	$ 12.26
Weighted Average Exercise Price, Outstanding, Ending Balance (in dollars per share)	$ 9.47	$ 7.40
Weighted Average Exercise Price, Vested and expected to vest (in dollars per share)	$ 9.30
Weighted Average Exercise Price, Exercisable (in dollars per share)	$ 7.37
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]
Weighted Average Remaining Contractual Term, Outstanding, Beginning Balance	8 years 3 months 18 days	8 years 6 months 22 days
Weighted Average Remaining Contractual Term, Vested and expected to vest	8 years 4 months 17 days
Weighted Average Remaining Contractual Term, Exercisable	8 years 4 months 10 days
Weighted Average Remaining Contractual Term, Outstanding, Ending Balance	8 years 3 months 18 days	8 years 6 months 22 days
Total Intrinsic Value, Outstanding	$ 374,453	$ 462,558
Total Intrinsic Value, Vested and expected to vest	367,820
Total Intrinsic Value, Exercisable	$ 282,126