Fair Value of Financial Instruments - Liabilities in Level 3 (Details) - USD ($) $ in Thousands	12 Months Ended
	Jan. 02, 2016	Jan. 03, 2015
Fair value liabilities reconciliation of changes
Fair value of debt	$ 77,500	$ 87,400
Assets and liabilities measured at fair value on recurring basis | Significant Unobservable Inputs (Level 3)
Fair value liabilities reconciliation of changes
Balance at the end of the period	14,073
Assets and liabilities measured at fair value on recurring basis | Significant Unobservable Inputs (Level 3) | Contingent consideration
Fair value liabilities reconciliation of changes
Balance at the beginning of the period	18,438	12,919
Settlements	(4,464)
Loss recognized in earnings (2)	99	5,519
Balance at the end of the period	14,073	18,438
Net loss for the period included in earnings attributable to contingent consideration held at the end of the period:	$ (99)	$ (5,519)