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CONDENSED CONSOLIDATED STATEMENTS OF INCOME (unaudited) - USD ($) shares in Millions, $ in Millions | 3 Months Ended
--- | ---
Jun. 30, 2018 | Jun. 30, 2017
Income Statement [Abstract] |  |  |
Net sales |  | $ 1,212.5 | $ 972.1
Cost of sales | [1] | 570.5 | 387.7
Gross profit |  | 642.0 | 584.4
Research and development | [1] | 171.9 | 130.5
Selling, general and administrative | [1] | 164.0 | 114.3
Amortization of acquired intangible assets |  | 133.7 | 120.8
Special charges and other, net | [1] | 40.1 | (2.8)
Operating expenses |  | 509.7 | 362.8
Operating income |  | 132.3 | 221.6
Losses on equity method investment |  | (0.1) | (0.1)
Other income (expense): |  |  |
Interest income |  | 5.7 | 3.5
Interest expense |  | (90.4) | (49.5)
Loss on settlement of convertible debt |  | 0.0 | (13.8)
Other (loss) income, net |  | (9.8) | 4.5
Income before income taxes |  | 37.7 | 166.2
Income tax provision (benefit) |  | 2.0 | (4.4)
Net income |  | $ 35.7 | $ 170.6
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
Dividends declared per common share (in USD per share) |  | $ 0.3635 | $ 0.3615
Basic common shares outstanding |  | 235.2 | 229.4
Diluted common shares outstanding |  | 252.2 | 242.9
Allocated Share-based Compensation Expense |  | $ 45.3 | $ 22.4
[1] | Includes share-based compensation expense as follows:Cost of sales 3.6 3.4 Research and development 14.1 10.3 Selling, general and administrative 11.7 8.7Special charges and other, net 15.9 0

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