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Fair Value and Derivative Instruments - Fair Value Assets Measured on Recurring Basis (Details) - USD ($) $ in Thousands | Mar. 27, 2021 | Dec. 26, 2020
--- | --- | ---
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Cash equivalents | $ 39,754 |
Marketable securities | 94,093 | $ 67,810
Total assets | 134,736 | 111,943
Contingent consideration | (3,884) | (4,012)
Total liabilities | (4,097) | (4,099)
Foreign exchange derivative contracts |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Derivative liability | (100) |
Foreign exchange derivative contracts | Designated as hedging instrument |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Derivative contracts | 144 | 1,057
Interest rate swap derivative contracts | Designated as hedging instrument |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Derivative contracts | 745 | 57
Derivative liability | (113) | (87)
Money market funds |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Cash equivalents | 34,254 | 43,019
Commercial paper |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Cash equivalents | 5,500 |
Marketable securities | 15,491 |
U.S. treasuries |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Marketable securities | 32,669 | 40,726
Certificates of deposit |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Marketable securities | 1,212 | 2,179
U.S. agency securities |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Marketable securities | 575 | 575
Corporate bonds |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Marketable securities | 44,146 | 24,330
Level 1 |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Cash equivalents | 39,754 |
Marketable securities | 32,669 | 40,726
Total assets | 72,423 | 83,745
Contingent consideration | 0 | 0
Total liabilities | 0 | 0
Level 1 | Foreign exchange derivative contracts |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Derivative liability | 0 |
Level 1 | Foreign exchange derivative contracts | Designated as hedging instrument |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Derivative contracts | 0 | 0
Level 1 | Interest rate swap derivative contracts | Designated as hedging instrument |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Derivative contracts | 0 | 0
Derivative liability | 0 | 0
Level 1 | Money market funds |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Cash equivalents | 34,254 | 43,019
Level 1 | Commercial paper |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Cash equivalents | 5,500 |
Marketable securities | 0 |
Level 1 | U.S. treasuries |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Marketable securities | 32,669 | 40,726
Level 1 | Certificates of deposit |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Marketable securities | 0 | 0
Level 1 | U.S. agency securities |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Marketable securities | 0 | 0
Level 1 | Corporate bonds |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Marketable securities | 0 | 0
Level 2 |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Cash equivalents | 0 |
Marketable securities | 61,424 | 27,084
Total assets | 62,313 | 28,198
Contingent consideration | 0 | 0
Total liabilities | (213) | (87)
Level 2 | Foreign exchange derivative contracts |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Derivative liability | (100) |
Level 2 | Foreign exchange derivative contracts | Designated as hedging instrument |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Derivative contracts | 144 | 1,057
Level 2 | Interest rate swap derivative contracts | Designated as hedging instrument |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Derivative contracts | 745 | 57
Derivative liability | (113) | (87)
Level 2 | Money market funds |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Cash equivalents | 0 | 0
Level 2 | Commercial paper |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Cash equivalents | 0 |
Marketable securities | 15,491 |
Level 2 | U.S. treasuries |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Marketable securities | 0 | 0
Level 2 | Certificates of deposit |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Marketable securities | 1,212 | 2,179
Level 2 | U.S. agency securities |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Marketable securities | 575 | 575
Level 2 | Corporate bonds |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Marketable securities | 44,146 | 24,330
Level 3 |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Cash equivalents | 0 |
Marketable securities | 0 | 0
Total assets | 0 | 0
Contingent consideration | (3,884) | (4,012)
Total liabilities | (3,884) | (4,012)
Level 3 | Foreign exchange derivative contracts |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Derivative liability | 0 |
Level 3 | Foreign exchange derivative contracts | Designated as hedging instrument |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Derivative contracts | 0 | 0
Level 3 | Interest rate swap derivative contracts | Designated as hedging instrument |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Derivative contracts | 0 | 0
Derivative liability | 0 | 0
Level 3 | Money market funds |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Cash equivalents | 0 | 0
Level 3 | Commercial paper |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Cash equivalents | 0 |
Marketable securities | 0 |
Level 3 | U.S. treasuries |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Marketable securities | 0 | 0
Level 3 | Certificates of deposit |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Marketable securities | 0 | 0
Level 3 | U.S. agency securities |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Marketable securities | 0 | 0
Level 3 | Corporate bonds |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Marketable securities | $ 0 | $ 0

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- Definition Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. + References No definition available. + Details
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