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Net income per common share attributable to Microchip Technology Stockholders (Details) - USD ($) $ / shares in Units, $ in Millions | 1 Months Ended | 12 Months Ended
--- | --- | ---
Nov. 30, 2017 | Jun. 30, 2017 | Feb. 28, 2017 | Feb. 28, 2015 | Mar. 31, 2018 | Mar. 31, 2017 | Mar. 31, 2016
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items] |  |  |  |  |  |  |
Net income from continuing operations attributable to Microchip Technology Stockholders |  |  |  |  | $ 255.4 | $ 170.6 | $ 324.1
Weighted average common shares outstanding |  |  |  |  | 232,900,000 | 217,200,000 | 203,400,000
Dilutive effect of stock options and RSUs |  |  |  |  | 4,400,000 | 4,400,000 | 3,300,000
Weighted average common and potential common shares outstanding |  |  |  |  | 248,900,000 | 234,800,000 | 217,400,000
Net income from continuing operations (in usd per share) |  |  |  |  | $ 1.10 | $ 0.79 | $ 1.59
Net income from continuing operations (in usd per share) |  |  |  |  | $ 1.03 | $ 0.73 | $ 1.49
Number of antidilutive option shares (in shares) |  |  |  |  | 0 | 0 | 298,015
2007 Junior Subordinated Convertible Notes |  |  |  |  |  |  |
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items] |  |  |  |  |  |  |
Dilutive effect of subordinated convertible debentures |  |  |  |  | 1,300,000 | 12,700,000 | 10,700,000
Shares issued to settle convertible debt |  |  |  |  | 3,700,000 |  |
Extinguishment of debt, amount |  |  |  |  | $ 143.8 |  |
Weighted average conversion price per share used in calculating dilutive effect of convertible debt amount per share |  |  |  |  | $ 23.59 | $ 24.01 | $ 24.73
2015 Senior Subordinated Convertible Debt |  |  |  |  |  |  |
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items] |  |  |  |  |  |  |
Dilutive effect of subordinated convertible debentures |  |  |  |  | 10,300,000 | 500,000 | 0
Weighted average conversion price per share used in calculating dilutive effect of convertible debt amount per share |  |  |  |  | $ 63.94 | $ 65.21 | $ 67.19
2017 Senior Subordinated Convertible Debt |  |  |  |  |  |  |
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items] |  |  |  |  |  |  |
Dilutive effect of subordinated convertible debentures |  |  |  |  | 0 | 0 | 0
Weighted average conversion price per share used in calculating dilutive effect of convertible debt amount per share |  |  |  |  | $ 99.71 | $ 100.58 | $ 0.00
2017 Junior Subordinated Convertible Debt |  |  |  |  |  |  |
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items] |  |  |  |  |  |  |
Dilutive effect of subordinated convertible debentures |  |  |  |  | 0 | 0 | 0
Weighted average conversion price per share used in calculating dilutive effect of convertible debt amount per share |  |  |  |  | $ 97.96 | $ 98.81 | $ 0.00
Long-term Debt | 2007 Junior Subordinated Convertible Notes |  |  |  |  |  |  |
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items] |  |  |  |  |  |  |
Shares issued to settle convertible debt |  | 3,200,000 | 11,997,924 |  | 3,200,000 |  |
Extinguishment of debt, amount | $ 14.6 | $ 111.3 | $ 431.3 | $ 575.0 | $ 111.3 |  |

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