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Net Income Per Share Options and Rights Excluded (Details) - shares shares in Thousands | 12 Months Ended
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Mar. 31, 2018 | Mar. 31, 2017 | Mar. 31, 2016
Anti-dilutive shares | 9,938 | 9,412 | 9,421
Employee stock options |  |  |
Anti-dilutive shares | 3,998 | 4,462 | 4,793
Stock purchase rights |  |  |
Anti-dilutive shares | 5,940 | 4,950 | 4,628

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- Definition Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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