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Cash, Cash Equivalents And Short Term Investments (Detail) - USD ($) $ in Thousands | Jan. 01, 2016 | Jan. 02, 2015
--- | --- | ---
Fair Value Measurements [Line Items] |  |
Amortized Cost | $ 171,699 | $ 154,380
Unrealized Gains | 1 | 27
Unrealized Losses | (107) | (4)
Estimated Fair Value | 171,593 | 154,403
U.S. Agency Securities |  |
Fair Value Measurements [Line Items] |  |
Amortized Cost | 41,946 |
Unrealized Gains | 1 |
Unrealized Losses | (106) |
Estimated Fair Value | 41,841 |
Cash |  |
Fair Value Measurements [Line Items] |  |
Amortized Cost | 115,221 | 84,012
Unrealized Gains | 0 | 0
Unrealized Losses | 0 | 0
Estimated Fair Value | 115,221 | 84,012
Money market securities |  |
Fair Value Measurements [Line Items] |  |
Amortized Cost | 10,530 | 45,478
Unrealized Gains | 0 | 0
Unrealized Losses | 0 | 0
Estimated Fair Value | 10,530 | 45,478
Total cash equivalents |  |
Fair Value Measurements [Line Items] |  |
Amortized Cost | 10,530 | 45,478
Unrealized Gains | 0 | 0
Unrealized Losses | 0 | 0
Estimated Fair Value | 10,530 | 45,478
Total cash and cash equivalents |  |
Fair Value Measurements [Line Items] |  |
Amortized Cost | 125,751 | 129,490
Unrealized Gains | 0 | 0
Unrealized Losses | 0 | 0
Estimated Fair Value | 125,751 | 129,490
State and municipal bonds |  |
Fair Value Measurements [Line Items] |  |
Amortized Cost | 4,002 | 24,890
Unrealized Gains | 0 | 27
Unrealized Losses | (1) | (4)
Estimated Fair Value | 4,001 | 24,913
Total short-term investments |  |
Fair Value Measurements [Line Items] |  |
Amortized Cost | 45,948 | 24,890
Unrealized Gains | 1 | 27
Unrealized Losses | (107) | (4)
Estimated Fair Value | $ 45,842 | $ 24,913

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