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Cash, cash equivalents and short-term investments (Detail) - USD ($) $ in Thousands | Dec. 29, 2017 | Dec. 30, 2016
--- | --- | ---
Fair Value Measurements [Line Items] |  |
Amortized Cost | $ 196,791 | $ 173,967
Unrealized Gains | 0 | 0
Unrealized Losses | (393) | (245)
Estimated Fair Value | 196,398 | 173,722
U.S. agency securities |  |
Fair Value Measurements [Line Items] |  |
Amortized Cost | 71,997 | 59,000
Unrealized Gains | 0 | 0
Unrealized Losses | (393) | (245)
Estimated Fair Value | 71,604 | 58,755
Cash |  |
Fair Value Measurements [Line Items] |  |
Amortized Cost | 115,052 | 93,049
Unrealized Gains | 0 | 0
Unrealized Losses | 0 | 0
Estimated Fair Value | 115,052 | 93,049
Money market securities |  |
Fair Value Measurements [Line Items] |  |
Amortized Cost | 9,742 | 21,918
Unrealized Gains | 0 | 0
Unrealized Losses | 0 | 0
Estimated Fair Value | 9,742 | 21,918
Total cash equivalents |  |
Fair Value Measurements [Line Items] |  |
Amortized Cost | 9,742 | 21,918
Unrealized Gains | 0 | 0
Unrealized Losses | 0 | 0
Estimated Fair Value | 9,742 | 21,918
Total cash and cash equivalents |  |
Fair Value Measurements [Line Items] |  |
Amortized Cost | 124,794 | 114,967
Unrealized Gains | 0 | 0
Unrealized Losses | 0 | 0
Estimated Fair Value | 124,794 | 114,967
Total short-term investments |  |
Fair Value Measurements [Line Items] |  |
Amortized Cost | 71,997 | 59,000
Unrealized Gains | 0 | 0
Unrealized Losses | (393) | (245)
Estimated Fair Value | $ 71,604 | $ 58,755

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