Debt Credit Facility (Details Textual) $ in Thousands	12 Months Ended
	Dec. 30, 2017 USD ($)	Dec. 31, 2016 USD ($)
Line of Credit Facility [Line Items]
Outstanding borrowings under Revolving Credit Facility	$ 85,000	$ 50,000
Revolving Credit Facility [Member]
Line of Credit Facility [Line Items]
Credit facility, current borrowing capacity	350,000
Credit facility, additional borrowing capacity available	250,000
Credit facility, maximum borrowing capacity	$ 600,000
Credit facility, maturity date	Jan. 28, 2022
Credit facility, interest rate at period end	2.62%
Outstanding borrowings under Revolving Credit Facility	$ 85,000	$ 50,000
Maximum [Member] | Revolving Credit Facility [Member]
Line of Credit Facility [Line Items]
Credit facility, commitment fee percentage	0.30%
Minimum [Member] | Revolving Credit Facility [Member]
Line of Credit Facility [Line Items]
Credit facility, commitment fee percentage	0.15%
Revolving Credit Facility [Member]
Line of Credit Facility [Line Items]
Credit facility, covenant, debit to EBITDA ratio	3
Credit facility, covenant, debt to EBITDA ratio after step up triggered by acquisition	3.50
Credit facility, covenant, required business acquisition consideration, minimum	$ 250,000
Revolving Credit Facility [Member] | Maximum [Member]
Line of Credit Facility [Line Items]
Credit facility, covenant, leverage ratio	3.25
Revolving Credit Facility [Member] | Minimum [Member]
Line of Credit Facility [Line Items]
Credit facility, covenant, leverage ratio	2.75
London Interbank Offered Rate (LIBOR) [Member] | Maximum [Member] | Revolving Credit Facility [Member]
Line of Credit Facility [Line Items]
Credit facility, interest rate spread	1.875%
London Interbank Offered Rate (LIBOR) [Member] | Minimum [Member] | Revolving Credit Facility [Member]
Line of Credit Facility [Line Items]
Credit facility, interest rate spread	1.25%
Base Rate [Member] | Maximum [Member] | Revolving Credit Facility [Member]
Line of Credit Facility [Line Items]
Credit facility, interest rate spread	0.875%
Base Rate [Member] | Minimum [Member] | Revolving Credit Facility [Member]
Line of Credit Facility [Line Items]
Credit facility, interest rate spread	0.25%