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Cash, Cash Equivalents And Short Term Investments (Detail) (USD $) In Thousands, unless otherwise specified | Oct. 03, 2014 | Jan. 03, 2014
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Fair Value Measurements [Line Items] |  |
Amortized Cost | $ 141,591 | $ 156,103
Unrealized Gains | 36 | 25
Unrealized Losses | (4) | (9)
Estimated Fair Value | 141,623 | 156,119
Cash |  |
Fair Value Measurements [Line Items] |  |
Amortized Cost | 71,368 | 85,849
Unrealized Gains | 0 | 0
Unrealized Losses | 0 | 0
Estimated Fair Value | 71,368 | 85,849
Money market securities |  |
Fair Value Measurements [Line Items] |  |
Amortized Cost | 44,246 | 37,099
Unrealized Gains | 0 | 0
Unrealized Losses | 0 | 0
Estimated Fair Value | 44,246 | 37,099
Total cash equivalents |  |
Fair Value Measurements [Line Items] |  |
Amortized Cost | 44,246 | 37,099
Unrealized Gains | 0 | 0
Unrealized Losses | 0 | 0
Estimated Fair Value | 44,246 | 37,099
Total cash and cash equivalents |  |
Fair Value Measurements [Line Items] |  |
Amortized Cost | 115,614 | 122,948
Unrealized Gains | 0 | 0
Unrealized Losses | 0 | 0
Estimated Fair Value | 115,614 | 122,948
State and municipal bonds |  |
Fair Value Measurements [Line Items] |  |
Amortized Cost | 25,977 | 33,155
Unrealized Gains | 36 | 25
Unrealized Losses | (4) | (9)
Estimated Fair Value | 26,009 | 33,171
Total short-term investments |  |
Fair Value Measurements [Line Items] |  |
Amortized Cost | 25,977 | 33,155
Unrealized Gains | 36 | 25
Unrealized Losses | (4) | (9)
Estimated Fair Value | $ 26,009 | $ 33,171

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- Definition This item represents the cost of debt securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.2) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27161-111563 + Details
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