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Summary of Significant Accounting Policies (Details Narrative) $ in Thousands |  | 12 Months Ended |
--- | --- | --- | ---
Jun. 10, 2016 SFr / shares shares | Dec. 30, 2017 USD ($) | Dec. 31, 2016 USD ($) | Dec. 26, 2015 USD ($) | Jun. 09, 2016 SFr / shares
Cumulative currency translation adjustments |  | $ 78,909 | $ (9,411) |  |
Foreign currency losses |  | (22,579) | (31,651) | $ (23,465) |
Dividends |  | 382,976 | 481,452 | 378,117 |
Intangible assets, net |  | 316,705 | 253,473 |  |
Accumulated amortization intangible assets |  | 193,886 | 173,023 |  |
Amortization expense intangible assets |  | 20,863 | 14,319 | 7,115 |
Amortization expense intangible assets, Next twelve months |  | 18,796 |  |  |
Amortization expense intangible assets, Year two |  | 16,293 |  |  |
Amortization expense intangible assets, Year three |  | 14,167 |  |  |
Amortization expense intangible assets, Year four |  | 10,463 |  |  |
Amortization expense intangible assets, Year five |  | 8,111 |  |  |
Goodwill |  | 286,982 | 224,553 | 187,791 |
Fair value available-for-sale securities unrealized losses |  | (22,864) | (27,350) |  |
Deferred revenues |  | 303,521 | 286,971 |  |
Total deferred Costs |  | 122,162 | 103,546 |  |
Deferred revenue and cost expenses, Next twelve months |  | 91,370 |  |  |
Deferred revenue and cost expenses, Year two |  | 48,627 |  |  |
Deferred revenue and cost expenses, Year three |  | 25,340 |  |  |
Deferred revenue and cost expenses, Year four |  | 11,208 |  |  |
Deferred revenue and cost expenses, Year five |  | 4,814 |  |  |
Advertising expense |  | 164,693 | 177,143 | 167,166 |
Research and development costs |  | $ 511,634 | 467,960 | $ 427,043 |
Number of shares cancelled | shares | 10,000,000 |  |  |  |
Decline in par value of common stock (in swiss francs per share) | SFr / shares | SFr 0.10 |  |  |  | SFr 10
Aviation Product [Member] |  |  |  |  |
Product warranty term |  | 2 years |  |  |
State Administration of Taxation, China [Member] |  |  |  |  |
Restricted retained earnings |  | $ 304,674 | $ 304,674 |  |
Minimum [Member] |  |  |  |  |
Acquired intangible assets useful life |  | 3 years |  |  |
Deferred revenues useful life |  | 1 year |  |  |
Minimum [Member] | Other Product Other Than Aviation Product [Member] |  |  |  |  |
Product warranty term |  | 1 year |  |  |
Maximum [Member] |  |  |  |  |
Acquired intangible assets useful life |  | 10 years |  |  |
Deferred revenues useful life |  | 5 years |  |  |
Maximum [Member] | Other Product Other Than Aviation Product [Member] |  |  |  |  |
Product warranty term |  | 2 years |  |  |
Customer Concentration Risk [Member] | Net Sales [Member] |  |  |  |  |
Concentration risk net sales |  | 10.00% | 10.00% | 10.00% |
Ten Customer Concentration Risk [Member] | Net Sales [Member] | Minimum [Member] |  |  |  |  |
Concentration risk net sales |  |  |  | 22.00% |
Ten Customer Concentration Risk [Member] | Net Sales [Member] | Maximum [Member] |  |  |  |  |
Concentration risk net sales |  |  |  | 24.00% |

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