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Financial Instruments and Derivatives - Additional Information (Detail) - USD ($) | 3 Months Ended | 9 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Oct. 04, 2015 | Sep. 28, 2014 | Oct. 04, 2015 | Sep. 28, 2014 | Dec. 31, 2014 | Jun. 11, 2015 | Oct. 31, 2014 | Dec. 31, 2013
Financial Instruments and Fair Value [Line Items] |  |  |  |  |  |  |  |
Available-for-sale securities, realized loss |  | $ 0 | $ 200,000 | $ 0 |  |  |  |
Available-for-sale securities, realized gain | $ 400,000 | 1,000,000 | 1,400,000 | 1,700,000 |  |  |  |
Contingent consideration | 14,447,000 |  | 14,447,000 |  | $ 895,000 |  |  |
Contingent consideration adjustment |  |  | (2,600,000) | (630,000) |  |  |  |
Available-for-sale marketable securities, Fair Market Value of Investments with Unrealized Losses | 73,034,000 |  | 73,034,000 |  | 583,076,000 |  |  |
Fair market value of investments with unrealized losses greater than one year | 300,000 |  | 300,000 |  | 2,300,000 |  |  |
Fair market value of investments with unrealized losses less than one year | 72,700,000 |  | 72,700,000 |  | 580,800,000 |  |  |
Available-for-sale marketable securities, Unrealized (Loss) | (1,921,000) |  | (1,921,000) |  | (867,000) |  |  |
Gains (losses) on foreign currency transactions | 100,000 | (400,000) | 2,300,000 | 900,000 |  |  |  |
Realized gain(loss) on foreign currency contracts | (800,000) | $ 200,000 | (2,700,000) | $ (1,600,000) |  |  |  |
AIT | Maximum |  |  |  |  |  |  |  |
Financial Instruments and Fair Value [Line Items] |  |  |  |  |  |  |  |
Contingent consideration |  |  |  |  |  |  | $ 2,100,000 |
Universal Robots |  |  |  |  |  |  |  |
Financial Instruments and Fair Value [Line Items] |  |  |  |  |  |  |  |
Contingent consideration |  |  |  |  |  | $ 33,800,000 |  |
Universal Robots | Maximum |  |  |  |  |  |  |  |
Financial Instruments and Fair Value [Line Items] |  |  |  |  |  |  |  |
Contingent consideration |  |  |  |  |  |  |  | $ 65,000,000
Avionics Interface Technologies, LLC |  |  |  |  |  |  |  |
Financial Instruments and Fair Value [Line Items] |  |  |  |  |  |  |  |
Contingent consideration |  |  |  |  |  |  | $ 1,800,000 |
Contingent consideration adjustment | (1,000,000) |  | (1,000,000) |  |  |  |  |
Foreign Currency Forward Contracts |  |  |  |  |  |  |  |
Financial Instruments and Fair Value [Line Items] |  |  |  |  |  |  |  |
Notional amount of foreign currency forward contracts | $ 91,500,000 |  | 91,500,000 |  | 73,000,000 |  |  |
Gains (losses) on foreign currency transactions |  |  | $ 0 |  | $ (100,000) |  |  |

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- Definition Aggregate notional amount specified by the derivative(s). Expressed as an absolute value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
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- Definition Amount before tax of unrealized loss in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27161-111563 + Details
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