Summary of Total Cost and Employer Contributions (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Jan. 02, 2016	Jan. 03, 2015
401(k) Retirement Savings Plans
Defined Benefit Plan Disclosure [Line Items]
Total cost and employer contributions	$ 27,057	$ 25,473	$ 24,799