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Quarterly Results (Unaudited) (Details) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 12 Months Ended
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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 | Mar. 31, 2015
Quarterly Financial Information Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Net sales | $ 1,002.3 | $ 994.2 | $ 1,012.1 | $ 972.1 | $ 902.7 | $ 834.4 | $ 871.4 | $ 799.4 | $ 3,980.8 | $ 3,407.8 | $ 2,173.3 |
Gross profit | 615.1 | 607.1 | 614.1 | 584.4 | 532.8 | 465.3 | 410.6 | 348.5 | 2,420.7 | 1,757.2 | 1,205.5 |
Operating income | 244.1 | 245.2 | 225.4 | 221.6 | 154.1 | 118.1 | 62.8 | (59.1) | 936.3 | 275.8 | 352.3 |
Net income from continuing operations | $ 146.7 | $ (251.1) | $ 189.2 | $ 170.6 | $ 136.9 | $ 107.2 | $ 33.9 | $ (113.4) | $ 255.4 | $ 164.6 | $ 323.9 |
Net income attributable to Microchip Technology (in usd per share) | $ 0.58 | $ (1.07) | $ 0.77 | $ 0.70 | $ 0.57 | $ 0.46 | $ 0.14 | $ (0.53) | $ 1.03 | $ 0.71 | $ 1.49 |
Loss on settlement of convertible debt |  | $ 2.2 |  | $ 13.8 | $ 43.9 |  |  |  | $ 16.0 | $ 43.9 | $ 0.0 | $ 50.6

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