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Cash, cash equivalents and short-term investments (Detail) - USD ($) $ in Thousands | Dec. 28, 2018 | Dec. 29, 2017
--- | --- | ---
Fair Value Measurements [Line Items] |  |
Amortized Cost | $ 208,693 | $ 196,791
Unrealized Gains | 91 | 0
Unrealized Losses | (230) | (393)
Estimated Fair Value | 208,554 | 196,398
U.S. Treasury and agency securities |  |
Fair Value Measurements [Line Items] |  |
Amortized Cost | 81,634 | 71,997
Unrealized Gains | 91 | 0
Unrealized Losses | (230) | (393)
Estimated Fair Value | 81,495 | 71,604
Cash |  |
Fair Value Measurements [Line Items] |  |
Amortized Cost | 120,846 | 115,052
Unrealized Gains | 0 | 0
Unrealized Losses | 0 | 0
Estimated Fair Value | 120,846 | 115,052
Money market securities |  |
Fair Value Measurements [Line Items] |  |
Amortized Cost | 6,213 | 9,742
Unrealized Gains | 0 | 0
Unrealized Losses | 0 | 0
Estimated Fair Value | 6,213 | 9,742
Total cash equivalents |  |
Fair Value Measurements [Line Items] |  |
Amortized Cost | 6,213 | 9,742
Unrealized Gains | 0 | 0
Unrealized Losses | 0 | 0
Estimated Fair Value | 6,213 | 9,742
Total cash and cash equivalents |  |
Fair Value Measurements [Line Items] |  |
Amortized Cost | 127,059 | 124,794
Unrealized Gains | 0 | 0
Unrealized Losses | 0 | 0
Estimated Fair Value | 127,059 | 124,794
Total short-term investments |  |
Fair Value Measurements [Line Items] |  |
Amortized Cost | 81,634 | 71,997
Unrealized Gains | 91 | 0
Unrealized Losses | (230) | (393)
Estimated Fair Value | $ 81,495 | $ 71,604

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