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Revenue Recognition (Details) - USD ($) | 3 Months Ended |
--- | --- | ---
Apr. 01, 2018 | Apr. 02, 2017 | Dec. 31, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Revenue | $ 169,567,000 | $ 139,039,000 |
Cost of revenue | 40,198,000 | 32,532,000 |
Gross margin | 129,369,000 | 106,507,000 |
Operating income | 34,596,000 | 37,216,000 |
Income before income tax expense | 37,979,000 | 39,235,000 |
Income tax expense (benefit) | 762,000 | (6,236,000) |
Net income | $ 37,217,000 | $ 45,471,000 |
Basic (in dollars per share) | $ 0.21 | $ 0.26 |
Diluted (in dollars per share) | $ 0.21 | $ 0.25 |
Prepaid expenses and other current assets | $ 26,068,000 |  | $ 30,683,000
Accrued income taxes | 11,915,000 |  | 11,503,000
Deferred revenue and customer deposits | 15,504,000 |  | 9,420,000
Retained earnings | 622,856,000 |  | 668,587,000
Revenues | 169,567,000 | $ 139,039,000 |
Costs to fulfill a contract | 4,615,000 |  | 3,230,000
Change in Contract with Customer, Asset [Abstract] |  |  |
Balance as of December 31, 2017 | 9,420,000 |  |
Increases to deferred revenue and customer deposits | 11,751,000 |  |
Recognition of revenue | (5,875,000) |  |
Foreign exchange rate changes | 208,000 |  |
Balance as of April 1, 2018 | 15,504,000 |  |
Standard products and services |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Revenues | 158,399,000 | 133,017 |
Application-specific customer solutions |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Revenues | 11,168,000 | 6,022 |
Americas |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Revenues | 59,217,000 | 42,540,000 |
Europe |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Revenues | 56,203,000 | 43,107,000 |
Greater China |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Revenues | 27,159,000 | 22,706,000 |
Other Asia |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Revenues | $ 26,988,000 | 30,686,000 |
As previously reported |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Revenue |  | 134,942,000 |
Cost of revenue |  | 28,225,000 |
Gross margin |  | 106,717,000 |
Operating income |  | 37,426,000 |
Income before income tax expense |  | 39,445,000 |
Income tax expense (benefit) |  | (6,210,000) |
Net income |  | $ 45,655,000 |
Basic (in dollars per share) |  | $ 0.26 |
Diluted (in dollars per share) |  | $ 0.26 |
Prepaid expenses and other current assets |  |  | 30,800,000
Accrued income taxes |  |  | 11,391,000
Deferred revenue and customer deposits |  |  | 9,969,000
Retained earnings |  |  | 668,267,000
Adjustment |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Revenue |  | $ 4,097,000 |
Cost of revenue |  | 4,307,000 |
Gross margin |  | (210,000) |
Operating income |  | (210,000) |
Income before income tax expense |  | (210,000) |
Income tax expense (benefit) |  | (26,000) |
Net income |  | $ (184,000) |
Basic (in dollars per share) |  | $ 0 |
Diluted (in dollars per share) |  | $ (10) |
Prepaid expenses and other current assets |  |  | (117,000)
Accrued income taxes |  |  | 112,000
Deferred revenue and customer deposits |  |  | (549,000)
Retained earnings |  |  | $ 320,000

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