Employee Stock Benefit Plans (Restricted Stock Units Outstanding) (Details) - Restricted Stock Units (RSUs) [Member] shares in Millions, $ in Millions	12 Months Ended
	Dec. 29, 2017 USD ($) shares	[1]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of Shares Underlying Restricted Stock Units | shares	4.7
Weighted Average Remaining Vesting Period	1 year 4 months 24 days
Aggregate Fair Value | $	$ 192.9

[1] For those shares expected to vest upon the achievement of specified performance goals, the amount represents of estimated number of shares that expect to vest based on the estimated achievement of such specified performance goals as of the end of fiscal 2017