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Fair Value Measurements (Details) - Recurring [Member] - USD ($) $ in Thousands | Oct. 03, 2015 | Jan. 03, 2015
--- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Marketable debt securities - current | $ 33,243 | $ 69,609
Marketable debt securities - noncurrent | 8,581 | 44,441
Marketable debt securities | 41,824 | 114,050
Level 1 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Marketable debt securities - current | 0 | 17,506
Marketable debt securities - noncurrent | 0 | 14,990
Marketable debt securities | 0 | 32,496
Deferred compensation plan liability | 1,500 | 1,000
Level 2 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Marketable debt securities - current | 33,243 | 52,103
Marketable debt securities - noncurrent | 8,581 | 29,451
Marketable debt securities | 41,824 | 81,554
Level 3 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Marketable debt securities - current | 0 | 0
Marketable debt securities - noncurrent | 0 | 0
Marketable debt securities | 0 | 0
Available-for-sale Securities [Member] | Level 1 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Marketable securities assets funding the deferred compensation plan | 1,500 | 1,000
US Treasury Securities [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Marketable debt securities - current |  | 17,506
Marketable debt securities - noncurrent |  | 14,990
US Treasury Securities [Member] | Level 1 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Marketable debt securities - current |  | 17,506
Marketable debt securities - noncurrent |  | 14,990
US Treasury Securities [Member] | Level 2 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Marketable debt securities - current |  | 0
Marketable debt securities - noncurrent |  | 0
US Treasury Securities [Member] | Level 3 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Marketable debt securities - current |  | 0
Marketable debt securities - noncurrent |  | 0
Corporate bonds [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Marketable debt securities - current | 12,597 | 20,139
Marketable debt securities - noncurrent | 5,013 | 15,236
Corporate bonds [Member] | Level 1 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Marketable debt securities - current | 0 | 0
Marketable debt securities - noncurrent | 0 | 0
Corporate bonds [Member] | Level 2 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Marketable debt securities - current | 12,597 | 20,139
Marketable debt securities - noncurrent | 5,013 | 15,236
Corporate bonds [Member] | Level 3 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Marketable debt securities - current | 0 | 0
Marketable debt securities - noncurrent | 0 | 0
U.S. Agency bonds [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Marketable debt securities - current | 2,513 | 12,525
Marketable debt securities - noncurrent | 2,498 | 10,014
U.S. Agency bonds [Member] | Level 1 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Marketable debt securities - current | 0 | 0
Marketable debt securities - noncurrent | 0 | 0
U.S. Agency bonds [Member] | Level 2 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Marketable debt securities - current | 2,513 | 12,525
Marketable debt securities - noncurrent | 2,498 | 10,014
U.S. Agency bonds [Member] | Level 3 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Marketable debt securities - current | 0 | 0
Marketable debt securities - noncurrent | 0 | 0
Municipal bonds [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Marketable debt securities - current | 8,140 | 6,953
Marketable debt securities - noncurrent | 1,070 | 4,201
Municipal bonds [Member] | Level 1 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Marketable debt securities - current | 0 | 0
Marketable debt securities - noncurrent | 0 | 0
Municipal bonds [Member] | Level 2 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Marketable debt securities - current | 8,140 | 6,953
Marketable debt securities - noncurrent | 1,070 | 4,201
Municipal bonds [Member] | Level 3 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Marketable debt securities - current | 0 | 0
Marketable debt securities - noncurrent | 0 | 0
Commercial Paper, Not Included with Cash and Cash Equivalents [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Marketable debt securities - current | 9,993 | 12,486
Commercial Paper, Not Included with Cash and Cash Equivalents [Member] | Level 1 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Marketable debt securities - current | 0 | 0
Commercial Paper, Not Included with Cash and Cash Equivalents [Member] | Level 2 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Marketable debt securities - current | 9,993 | 12,486
Commercial Paper, Not Included with Cash and Cash Equivalents [Member] | Level 3 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Marketable debt securities - current | $ 0 | $ 0

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