Fair Value of Financial Instruments (Details 5) (USD $)	12 Months Ended
	Jan. 03, 2015	Dec. 28, 2013
Fair value liabilities reconciliation of changes
Fair value of debt	$ 87,400,000	$ 94,800,000
Assets and liabilities measured at fair value on recurring basis | Contingent consideration
Fair value liabilities reconciliation of changes
Balance at the beginning of the period	12,919,000	2,750,000
Issues		13,964,000
Loss recognized in earnings	5,519,000	(3,795,000)
Balance at the end of the period	18,438,000	12,919,000
Net gain (loss) for the period included in earnings attributable to contingent consideration held at the end of the period:	$ (5,519,000)	$ 1,045,000