Summary of Significant Accounting Policies - Recent Accounting Standards Adopted (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 28, 2019	Dec. 30, 2018
Recent Accounting Standards
CRA elected package of practical expedients	true
Operating lease right-of-use assets	$ 110,999
Recognize lease liabilities	137,467
ASU 2016-02
Recent Accounting Standards
Operating lease right-of-use assets	82,300	$ 82,300
Recognize lease liabilities	$ 106,800	$ 106,800