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Net income per common share (Notes) | 6 Months Ended
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Sep. 30, 2014
Earnings Per Share [Abstract] |
Net income per common share | Net Income Per Common Share Attributable to Microchip Technology Stockholders The following table sets forth the computation of basic and diluted net income per common share attributable to Microchip Technology stockholders (in thousands, except per share amounts):
| Three Months Ended |  | Six Months Ended
| September 30, |  | September 30,
| 2014 |  | 2013 |  | 2014 |  | 2013
Net income attributable to Microchip Technology | $ | 93,641 |  |  | $ | 99,806 |  |  | $ | 183,550 |  |  | $ | 178,385 |
Weighted average common shares outstanding | 200,629 |  |  | 197,825 |  |  | 200,408 |  |  | 197,388 |
Dilutive effect of stock options and RSUs | 3,767 |  |  | 4,144 |  |  | 3,780 |  |  | 3,908 |
Dilutive effect of convertible debt | 20,888 |  |  | 14,506 |  |  | 20,718 |  |  | 13,075 |
Weighted average common and potential common shares outstanding | 225,284 |  |  | 216,475 |  |  | 224,906 |  |  | 214,371 |
Basic net income per common share attributable to Microchip Technology stockholders | $ | 0.47 |  |  | $ | 0.50 |  |  | $ | 0.92 |  |  | $ | 0.90 |
Diluted net income per common share attributable to Microchip Technology stockholders | $ | 0.42 |  |  | $ | 0.46 |  |  | $ | 0.82 |  |  | $ | 0.83 |
The Company computed basic earnings per common share attributable to its stockholders using net income available to common stockholders and the weighted average number of common shares outstanding during the period. The Company computed diluted earnings per common share attributable to its stockholders using net income available to stockholders and the weighted average number of common shares outstanding plus potentially dilutive common shares outstanding during the period. Potentially dilutive common shares from employee equity incentive plans are determined by applying the treasury stock method to the assumed exercise of outstanding stock options and the assumed vesting of outstanding RSUs. Diluted net income per common share attributable to stockholders for the three and six months ended September 30, 2014 includes 20,887,608 shares and 20,717,720 shares, respectively, issuable upon the exchange of debentures (see Note 15). Diluted net income per common share attributable to stockholders for the three and six months ended September 30, 2013 includes 14,506,100 shares and 13,075,168 shares, respectively, issuable upon the exchange of debentures. The debentures have no impact on diluted net income per common share unless the average price of the Company's common stock exceeds the conversion price because the principal amount of the debentures will be settled in cash upon conversion. Prior to conversion, the Company will include, in the diluted net income per common share calculation, the effect of the additional shares that may be issued when the Company's common stock price exceeds the conversion price using the treasury stock method. The weighted average conversion price per share used in calculating the dilutive effect of the convertible debt for the three and six-month periods ended September 30, 2014 was $25.58 and $25.67, respectively. The weighted average conversion price per share used in calculating the dilutive effect of the convertible debt for the three and six-month periods ended September 30, 2013 was $26.42 and $26.54, respectively. Weighted average common shares exclude the effect of option shares which are not dilutive. There were no antidilutive option shares for each of the three and six-month periods ended September 30, 2014 and September 30, 2013.

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