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Net Income Per Common Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions | 3 Months Ended
--- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2016
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |
Net income | $ 35.7 | $ 170.6 |
Weighted average common shares outstanding | 235.2 | 229.4 |
Dilutive effect of stock options and RSUs | 4.0 | 4.5 |
Weighted average common and potential common shares outstanding | 252.2 | 242.9 |
Basic net income attributable to Microchip Technology, per common share (in USD per share) | $ 0.15 | $ 0.74 |
Diluted net income attributable to Microchip Technology, per common share (in USD per share) | $ 0.14 | $ 0.70 |
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 | 0.0 | 4.1 |
Weighted average conversion price per share used in calculating dilutive effect of convertible debt (amount per share) | $ 0.00 | $ 23.69 |
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 | 13.0 |  | 4.9
Weighted average conversion price per share used in calculating dilutive effect of convertible debt (amount per share) | $ 63.27 | $ 64.35 |
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) | $ 98.67 | $ 100.35 |
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) | $ 96.93 | $ 98.59 |

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- Definition The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 55 -Paragraph 52 -URI http://asc.fasb.org/extlink&oid=96948231&loc=d3e4984-109258 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(19)) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=96947427&loc=d3e1252-109256 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(21)) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04(23)) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 + Details
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