Note 9 - Borrowings (Details Textual) $ in Thousands	12 Months Ended
	Dec. 30, 2018 USD ($)	Dec. 31, 2017 USD ($)	Jan. 01, 2017 USD ($)
Threshold Of Other Indebtedness Triggering Default	$ 20,000
Long-term Debt, Total	618,581
Payments of Debt Issuance Costs	8,806	$ 1,427	$ 0
Debt Instrument, Unamortized Discount (Premium), Net, Total	8,100
Interest Rate Swap [Member]
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, before Tax	0
Derivative, Notional Amount	100,000
Interest Rate Swap [Member] | Other Assets [Member]
Derivative Asset, Fair Value, Gross Asset, Total	1,800
Syndicated Facility Agreement [Member]
Line of Credit Facility, Maximum Borrowing Capacity	$ 300,000
Maximum Percentage Of First Tier Subsidiary Stock Pledged As Collateral	65.00%
Long-term Line of Credit, Total	$ 10,600
Letters of Credit Outstanding, Amount	$ 3,600
Long-term Debt, Weighted Average Interest Rate, at Point in Time	3.50%
Syndicated Facility Agreement [Member] | Term Loan [Member]
Long-term Debt, Total	$ 616,100
Syndicated Facility Agreement [Member] | For Each Fiscal Quarter Thereafter [Member]
Maximum Consolidated Net Leverage Ratio	4.5
Minimum Consolidated Interest Coverage Ratio	2.25
Syndicated Facility Agreement [Member] | Minimum [Member]
Line of Credit Facility, Interest Rate During Period	0.25%
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage	0.20%
Syndicated Facility Agreement [Member] | Minimum [Member] | London Interbank Offered Rate (LIBOR) [Member]
Debt Instrument, Basis Spread on Variable Rate	1.25%
Syndicated Facility Agreement [Member] | Maximum [Member]
Line of Credit Facility, Interest Rate During Period	1.25%
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage	0.35%
Syndicated Facility Agreement [Member] | Maximum [Member] | London Interbank Offered Rate (LIBOR) [Member]
Debt Instrument, Basis Spread on Variable Rate	2.25%
Other Line Of Credit [Member]
Line of Credit Facility, Maximum Borrowing Capacity	$ 9,500
Long-term Line of Credit, Total	$ 0	0
Other Line Of Credit [Member] | Minimum [Member]
Line of Credit Facility, Interest Rate During Period	2.50%
Other Line Of Credit [Member] | Maximum [Member]
Line of Credit Facility, Interest Rate During Period	6.50%
Revolving Credit Facility [Member]
Debt Issuance Costs, Net, Total	$ 1,800	2,300
Amortization of Debt Issuance Costs and Discounts, Total	$ 500	$ 500	$ 500