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Cash, Cash Equivalents and Investments (Details) - USD ($) $ in Thousands | 9 Months Ended |
--- | --- | ---
Oct. 03, 2015 | Jan. 03, 2015
Available-for-sale securities |  |
Available-for-sale securities, Cost | $ 187,755 |
Cash, cash equivalents and investments |  |
Auction-rate securities guaranteed by the U.S. government | 6,000 |
Auction-rate securities privately insured | 2,000 |
Auction-rate securities having credit rating 'AA' | 6,000 |
Auction-rate securities having credit rating 'A' | 2,000 |
Other-than-temporary impairment losses | 0 |
Cash on hand, Cost | 68,421 | $ 52,144
Cash on hand, Fair Value | 68,421 | 52,144
Cash and cash equivalents, Cost | 135,640 | 141,705
Cash and cash equivalents, Gross Unrealized Gains |  | 1
Cash and cash equivalents, Fair Value | 135,640 | 141,706
Cash Equivalents: |  |
Available-for-sale securities |  |
Available-for-sale securities, Cost | 67,219 | 89,561
Available-for-sale securities, Gross Unrealized Gains |  | 1
Available-for-sale securities, Fair Value | 67,219 | 89,562
Short-term Investments: |  |
Available-for-sale securities |  |
Available-for-sale securities, Cost | 112,536 | 193,365
Available-for-sale securities, Gross Unrealized Losses | (13) | (73)
Available-for-sale securities, Gross Unrealized Gains | 147 | 197
Available-for-sale securities, Fair Value | 112,670 | 193,489
Long-term Investments: |  |
Available-for-sale securities |  |
Available-for-sale securities, Cost | 8,000 | 8,000
Available-for-sale securities, Gross Unrealized Losses | (760) | (581)
Available-for-sale securities, Fair Value | 7,240 | 7,419
Money market funds | Cash Equivalents: |  |
Available-for-sale securities |  |
Available-for-sale securities, Cost | 63,316 | 71,415
Available-for-sale securities, Fair Value | 63,316 | 71,415
Municipal bonds | Cash Equivalents: |  |
Available-for-sale securities |  |
Available-for-sale securities, Cost |  | 1,756
Available-for-sale securities, Gross Unrealized Gains |  | 1
Available-for-sale securities, Fair Value |  | 1,757
Municipal bonds | Short-term Investments: |  |
Available-for-sale securities |  |
Available-for-sale securities, Cost | 98,605 | 129,005
Available-for-sale securities, Gross Unrealized Losses | (10) | (25)
Available-for-sale securities, Gross Unrealized Gains | 146 | 172
Available-for-sale securities, Fair Value | 98,741 | 129,152
Variable-rate demand notes | Short-term Investments: |  |
Available-for-sale securities |  |
Available-for-sale securities, Cost | 9,495 | 12,915
Available-for-sale securities, Fair Value | 9,495 | 12,915
Corporate bonds | Cash Equivalents: |  |
Available-for-sale securities |  |
Available-for-sale securities, Cost |  | 1,101
Available-for-sale securities, Fair Value |  | 1,101
Corporate bonds | Short-term Investments: |  |
Available-for-sale securities |  |
Available-for-sale securities, Cost | 2,202 | 33,043
Available-for-sale securities, Gross Unrealized Losses | (3) | (35)
Available-for-sale securities, Gross Unrealized Gains |  | 25
Available-for-sale securities, Fair Value | 2,199 | 33,033
International government bonds | Short-term Investments: |  |
Available-for-sale securities |  |
Available-for-sale securities, Cost | 2,234 | 2,526
Available-for-sale securities, Gross Unrealized Losses |  | (10)
Available-for-sale securities, Gross Unrealized Gains | 1 |
Available-for-sale securities, Fair Value | 2,235 | 2,516
Commercial paper | Cash Equivalents: |  |
Available-for-sale securities |  |
Available-for-sale securities, Cost |  | 5,348
Available-for-sale securities, Fair Value |  | 5,348
Commercial paper | Short-term Investments: |  |
Available-for-sale securities |  |
Available-for-sale securities, Cost |  | 8,995
Available-for-sale securities, Fair Value |  | 8,995
Certificates of deposit | Cash Equivalents: |  |
Available-for-sale securities |  |
Available-for-sale securities, Cost | 3,903 | 7,739
Available-for-sale securities, Fair Value | 3,903 | 7,739
Certificates of deposit | Short-term Investments: |  |
Available-for-sale securities |  |
Available-for-sale securities, Cost |  | 250
Available-for-sale securities, Fair Value |  | 250
US government agency | Cash Equivalents: |  |
Available-for-sale securities |  |
Available-for-sale securities, Cost |  | 1,202
Available-for-sale securities, Fair Value |  | 1,202
US government agency | Short-term Investments: |  |
Available-for-sale securities |  |
Available-for-sale securities, Cost |  | 601
Available-for-sale securities, Fair Value |  | 601
U.S. government bonds | Cash Equivalents: |  |
Available-for-sale securities |  |
Available-for-sale securities, Cost |  | 1,000
Available-for-sale securities, Fair Value |  | 1,000
U.S. government bonds | Short-term Investments: |  |
Available-for-sale securities |  |
Available-for-sale securities, Cost |  | 650
Available-for-sale securities, Fair Value |  | 650
Asset-backed securities | Short-term Investments: |  |
Available-for-sale securities |  |
Available-for-sale securities, Cost |  | 5,380
Available-for-sale securities, Gross Unrealized Losses |  | (3)
Available-for-sale securities, Fair Value |  | 5,377
Auction rate securities | Long-term Investments: |  |
Available-for-sale securities |  |
Available-for-sale securities, Cost | 8,000 | 8,000
Available-for-sale securities, Gross Unrealized Losses | (760) | (581)
Available-for-sale securities, Fair Value | $ 7,240 | $ 7,419

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