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Cash, cash equivalents and short-term investments (Detail) - USD ($) $ in Thousands | Dec. 30, 2016 | Jan. 01, 2016
--- | --- | ---
Fair Value Measurements [Line Items] |  |
Amortized Cost | $ 173,967 | $ 171,699
Unrealized Gains | 0 | 1
Unrealized Losses | (245) | (107)
Estimated Fair Value | 173,722 | 171,593
U.S. agency securities |  |
Fair Value Measurements [Line Items] |  |
Amortized Cost | 59,000 | 41,946
Unrealized Gains | 0 | 1
Unrealized Losses | (245) | (106)
Estimated Fair Value | 58,755 | 41,841
Cash |  |
Fair Value Measurements [Line Items] |  |
Amortized Cost | 93,049 | 115,221
Unrealized Gains | 0 | 0
Unrealized Losses | 0 | 0
Estimated Fair Value | 93,049 | 115,221
Money market securities |  |
Fair Value Measurements [Line Items] |  |
Amortized Cost | 21,918 | 10,530
Unrealized Gains | 0 | 0
Unrealized Losses | 0 | 0
Estimated Fair Value | 21,918 | 10,530
Total cash equivalents |  |
Fair Value Measurements [Line Items] |  |
Amortized Cost | 21,918 | 10,530
Unrealized Gains | 0 | 0
Unrealized Losses | 0 | 0
Estimated Fair Value | 21,918 | 10,530
Total cash and cash equivalents |  |
Fair Value Measurements [Line Items] |  |
Amortized Cost | 114,967 | 125,751
Unrealized Gains | 0 | 0
Unrealized Losses | 0 | 0
Estimated Fair Value | 114,967 | 125,751
State and municipal bonds |  |
Fair Value Measurements [Line Items] |  |
Amortized Cost |  | 4,002
Unrealized Gains |  | 0
Unrealized Losses |  | (1)
Estimated Fair Value |  | 4,001
Total short-term investments |  |
Fair Value Measurements [Line Items] |  |
Amortized Cost | 59,000 | 45,948
Unrealized Gains | 0 | 1
Unrealized Losses | (245) | (107)
Estimated Fair Value | $ 58,755 | $ 45,842

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