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Net Income (Loss) Per Share | 9 Months Ended
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Mar. 31, 2018
Earnings Per Share [Abstract] |
Net Income (Loss) Per Share | Net Income Per Common Share Attributable to Alpha and Omega Semiconductor Limited The following table presents the calculation of basic and diluted net income per share attributable to common shareholders:
| Three Months Ended March 31, |  | Nine Months Ended March 31,
| 2018 |  | 2017 |  | 2018 |  | 2017
| (in thousands, except per share data)
Numerator: |  |  |  |  |  |  |
Net income attributable to Alpha and Omega Semiconductor Limited | $ | 1,651 |  |  | $ | 3,556 |  |  | $ | 13,242 |  |  | $ | 9,710 |
Denominator: |  |  |  |  |  |  |
Basic: |  |  |  |  |  |  |
Weighted average number of common shares used to compute basic net income per share | 23,795 |  |  | 23,675 |  |  | 23,914 |  |  | 23,396 |
Diluted: |  |  |  |  |  |  |
Weighted average number of common shares used to compute basic net income per share | 23,795 |  |  | 23,675 |  |  | 23,914 |  |  | 23,396 |
Effect of potentially dilutive securities: |  |  |  |  |  |  |
Stock options, RSUs and ESPP shares | 960 |  |  | 1,276 |  |  | 1,002 |  |  | 1,385 |
Weighted average number of common shares used to compute diluted net income per share | 24,755 |  |  | 24,951 |  |  | 24,916 |  |  | 24,781 |
Net income per share attributable to Alpha and Omega Semiconductor Limited: |  |  |  |  |  |  |
Basic | $ | 0.07 |  |  | $ | 0.15 |  |  | $ | 0.55 |  |  | $ | 0.42 |
Diluted | $ | 0.07 |  |  | $ | 0.14 |  |  | $ | 0.53 |  |  | $ | 0.39 |
The following potential dilutive securities were excluded from the computation of diluted net income per share as their effect would have been anti-dilutive:
| Three Months Ended March 31, |  | Nine Months Ended March 31,
| 2018 |  | 2017 |  | 2018 |  | 2017
| (in thousands) |  | (in thousands)
Employee stock options and RSUs | 165 |  |  | 3 |  |  | 167 |  |  | 83 |
ESPP | 381 |  |  | 20 |  |  | 157 |  |  | 12 |
Total potential dilutive securities | 546 |  |  | 23 |  |  | 324 |  |  | 95 |

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- Definition The entire disclosure for earnings per share. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -URI http://asc.fasb.org/topic&trid=2144383 + Details
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