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Cash, Cash Equivalents and Investments (Details) - USD ($) $ in Thousands | 6 Months Ended |
--- | --- | ---
Jul. 04, 2015 | Jan. 03, 2015
Available-for-sale securities |  |
Available-for-sale securities, Cost | $ 215,115 |
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 | 65,449 | $ 52,144
Cash on hand, Fair Value | 65,449 | 52,144
Cash and cash equivalents, Cost | 125,051 | 141,705
Cash and cash equivalents, Gross Unrealized Gains |  | 1
Cash and cash equivalents, Fair Value | 125,051 | 141,706
Cash Equivalents: |  |
Available-for-sale securities |  |
Available-for-sale securities, Cost | 59,602 | 89,561
Available-for-sale securities, Gross Unrealized Gains |  | 1
Available-for-sale securities, Fair Value | 59,602 | 89,562
Short-term Investments: |  |
Available-for-sale securities |  |
Available-for-sale securities, Cost | 147,513 | 193,365
Available-for-sale securities, Gross Unrealized Losses | (54) | (73)
Available-for-sale securities, Gross Unrealized Gains | 97 | 197
Available-for-sale securities, Fair Value | 147,556 | 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 | (821) | (581)
Available-for-sale securities, Fair Value | 7,179 | 7,419
Money market funds | Cash Equivalents: |  |
Available-for-sale securities |  |
Available-for-sale securities, Cost | 43,689 | 71,415
Available-for-sale securities, Fair Value | 43,689 | 71,415
Municipal bonds | Cash Equivalents: |  |
Available-for-sale securities |  |
Available-for-sale securities, Cost | 543 | 1,756
Available-for-sale securities, Gross Unrealized Gains |  | 1
Available-for-sale securities, Fair Value | 543 | 1,757
Municipal bonds | Short-term Investments: |  |
Available-for-sale securities |  |
Available-for-sale securities, Cost | 122,148 | 129,005
Available-for-sale securities, Gross Unrealized Losses | (45) | (25)
Available-for-sale securities, Gross Unrealized Gains | 96 | 172
Available-for-sale securities, Fair Value | 122,199 | 129,152
Variable-rate demand notes | Short-term Investments: |  |
Available-for-sale securities |  |
Available-for-sale securities, Cost | 14,495 | 12,915
Available-for-sale securities, Fair Value | 14,495 | 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 | 7,431 | 33,043
Available-for-sale securities, Gross Unrealized Losses | (6) | (35)
Available-for-sale securities, Gross Unrealized Gains | 1 | 25
Available-for-sale securities, Fair Value | 7,426 | 33,033
International government bonds | Short-term Investments: |  |
Available-for-sale securities |  |
Available-for-sale securities, Cost | 2,240 | 2,526
Available-for-sale securities, Gross Unrealized Losses | (3) | (10)
Available-for-sale securities, Fair Value | 2,237 | 2,516
Commercial paper | Cash Equivalents: |  |
Available-for-sale securities |  |
Available-for-sale securities, Cost | 9,823 | 5,348
Available-for-sale securities, Fair Value | 9,823 | 5,348
Commercial paper | Short-term Investments: |  |
Available-for-sale securities |  |
Available-for-sale securities, Cost | 1,199 | 8,995
Available-for-sale securities, Fair Value | 1,199 | 8,995
Certificates of deposit | Cash Equivalents: |  |
Available-for-sale securities |  |
Available-for-sale securities, Cost | 5,547 | 7,739
Available-for-sale securities, Fair Value | 5,547 | 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 | (821) | (581)
Available-for-sale securities, Fair Value | $ 7,179 | $ 7,419

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