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Common Shares (Tables) | 12 Months Ended
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Mar. 31, 2019
Notes To Financial Statements [Abstract] |
Schedule of Weighted Average Number of Shares [Table Text Block] |
Years ended March 31, |  | 2019 |  | 2018 |  | 2017
Denominator (shares in thousands): |  |  |  |  |  |
Weighted average shares outstanding—basic |  | 84,577 |  |  | 85,028 |  |  | 85,473 |
Dilutive effect of share equivalents |  | 891 |  |  | 685 |  |  | 621 |
Weighted average shares outstanding and share equivalents—diluted |  | 85,468 |  |  | 85,713 |  |  | 86,094 |
Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block] | Options to purchase the following number of shares were outstanding but excluded from the computation of diluted earnings per share because the combined exercise prices, unamortized fair values, and assumed tax benefits upon exercise were greater than the average market price for the shares during the periods, so including these options would be anti-dilutive:
Years ended March 31, |  | 2019 |  | 2018 |  | 2017
Number of ordinary share options (shares in thousands) |  | 352 |  |  | 393 |  |  | 576 |

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- Definition Notes to Financial Statements [Abstract] + References No definition available. + Details
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- Definition Tabular disclosure of securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) in the future that were not included in the computation of diluted EPS because to do so would increase EPS amounts or decrease loss per share amounts for the period presented, by antidilutive securities. + 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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- Definition Tabular disclosure of the weighted average number of shares used in calculating basic net earnings per share (or unit) and diluted earnings per share (or unit). + 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 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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