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Net Income Per Common Share (Details) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |
Net income | $ 96.3 | $ 189.2 | $ 132.0 | $ 359.7
Weighted average common shares outstanding | 235,800,000 | 233,300,000 | 235,500,000 | 231,400,000
Dilutive effect of stock options and RSUs | 4,300,000 | 4,500,000 | 4,200,000 | 4,400,000
Incremental common shares attributable to dilutive effect of written put options | 0 | 0 | 0 | 0
Weighted average common and potential common shares outstanding | 251,800,000 | 244,800,000 | 252,000,000 | 243,800,000
Basic net income attributable to Microchip Technology, per common share (in usd per share) | $ 0.41 | $ 0.81 | $ 0.56 | $ 1.55
Diluted net income attributable to Microchip Technology, per common share (in usd per share) | $ 0.38 | $ 0.77 | $ 0.52 | $ 1.48
2007 Junior Convertible Debt |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |
Incremental common shares attributable to dilutive effect of conversion of debt securities | 0 | 700,000 | 0 | 2,400,000
Weighted average conversion price per share used in calculating dilutive effect of convertible debt (amount per share) | $ 0.00 | $ 23.58 | $ 0.00 | $ 23.64
2015 Senior Convertible Debt |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |
Incremental common shares attributable to dilutive effect of conversion of debt securities | 11,700,000 | 6,300,000 | 12,300,000 | 5,600,000
Weighted average conversion price per share used in calculating dilutive effect of convertible debt (amount per share) | $ 63.02 | $ 64.06 | $ 63.14 | $ 64.21
2017 Senior Convertible Debt |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |
Incremental common shares attributable to dilutive effect of conversion of debt securities | 0 | 0 | 0 | 0
Weighted average conversion price per share used in calculating dilutive effect of convertible debt (amount per share) | $ 98.27 | $ 99.90 | $ 98.47 | $ 100.13
2017 Junior Convertible Debt |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |
Incremental common shares attributable to dilutive effect of conversion of debt securities | 0 | 0 | 0 | 0
Weighted average conversion price per share used in calculating dilutive effect of convertible debt (amount per share) | $ 96.55 | $ 98.15 | $ 96.74 | $ 98.37

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