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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

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