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Defined Contribution Plans	12 Months Ended
Defined Contribution Plans	Dec. 30, 2017
Retirement Benefits [Abstract]
Defined Contribution Plans	Defined Contribution Plans The Company has a retirement savings plan, commonly known as a 401(k) plan, that allows participating employees in the United States to contribute up to 100% of their pre-tax salary subject to Internal Revenue Service limits. The Company matched 75% of employees’ contributions up to 6% of their compensation to a maximum per employee match of $12,150, $11,925 and $11,925 for 2017, 2016 and 2015, respectively. The Company’s contributions to the 401(k) plan for 2017, 2016 and 2015 were approximately $18 million, $16 million and $16 million, respectively.