Prepaid Expenses and Other Current Assets, and Other Assets (Details) - USD ($) $ in Thousands	6 Months Ended
	Jul. 04, 2015	Jan. 03, 2015
Prepaid expenses and other assets disclosures
Term of forgivable loans or advances to employees and non-employee experts, minimum	3 years
Term of forgivable loans or advances to employees and non-employee experts, maximum	8 years
Forgivable loans issued to future employees for future service	$ 6,300
Other assets
Forgivable loans to employees and non-employee experts	37,873	$ 42,907
Other	4,931	5,008
Total	$ 42,804	$ 47,915