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Quarterly Summary of Information (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2018 | Mar. 31, 2017 | Mar. 31, 2016
Summarized unaudited quarterly financial data |  |  |  |  |  |  |  |  |  |  |
Net sales | $ 400,684 | $ 810,478 | $ 482,460 | $ 209,717 | $ 369,465 | $ 760,345 | $ 485,944 | $ 174,393 | $ 1,903,339 | $ 1,790,147 | $ 1,875,197
Gross profit | 192,429 | 423,471 | 225,117 | 90,625 | 158,924 | 383,634 | 216,425 | 76,252 | 931,642 | 835,235 | 846,668
(Loss) income from operations | 18,294 | 193,191 | 67,355 | (56,256) | (30,873) | 53,250 | 54,023 | (78,319) | $ 222,584 | $ (1,919) | $ 162,127
Net (loss) income | $ 20,615 | $ 86,341 | $ 49,559 | $ (42,121) | $ (15,704) | $ 41,027 | $ 39,305 | $ (58,918) |  |  |
Net income per share: |  |  |  |  |  |  |  |  |  |  |
Basic (in dollars per share) | $ 0.66 | $ 2.71 | $ 1.55 | $ (1.32) | $ (0.49) | $ 1.28 | $ 1.23 | $ (1.84) | $ 3.60 | $ 0.18 | $ 3.76
Diluted (in dollars per share) | $ 0.66 | $ 2.69 | $ 1.54 | $ (1.32) | $ (0.49) | $ 1.27 | $ 1.21 | $ (1.84) | $ 3.58 | $ 0.18 | $ 3.70
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Restructuring charges |  |  |  |  |  |  |  |  | $ 1,667 | $ 28,984 | $ 24,673
Impairment of goodwill |  |  |  |  |  |  |  |  | $ 0 | $ 113,944 | $ 0
Sanuk |  |  |  |  |  |  |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Impairment of goodwill |  |  |  |  |  | $ 113,944 |  |  |  |  |
Patents | Sanuk |  |  |  |  |  |  |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Impairment of intangible assets (excluding goodwill) |  |  |  |  |  | $ 4,086 |  |  |  |  |

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