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Common Shares (Details) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Mar. 31, 2019 £ / shares | Mar. 31, 2019 £ / shares shares | Mar. 31, 2018 £ / shares shares | Mar. 31, 2017 USD ($) shares | May 03, 2019 $ / shares | Mar. 31, 2019 USD ($) $ / shares shares | Mar. 31, 2019 EUR (€) shares | Mar. 31, 2018 USD ($) shares | Mar. 31, 2016 USD ($) | Dec. 31, 2015 £ / shares | Dec. 31, 2015 USD ($) shares
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |  |  |  |  |  |  |  |
Common Stock, Par or Stated Value Per Share | (per share) |  |  | £ 0.10 |  | $ 0.001 | $ 75.00 |  |  |  |  |
Ordinary shares, with $75 par value; 84,517 and 84,747 ordinary shares issued and outstanding, respectively | $ |  |  |  |  |  | $ 1,998,564 |  | $ 2,048,037 |  |  |
Preferred Stock, Dividend Rate, Percentage | 5.00% |  |  |  |  |  |  |  |  |  |
Preferred Stock, Shares Issued |  |  |  |  |  | 0 | 0 | 100,000 |  |  | 100,000
Preferred Stock, Par or Stated Value Per Share | (per share) | £ 0.001 | £ 0.001 | £ 0.10 |  |  | $ 0.001 |  |  |  |  |
Preferred shares, with $0.001 and £0.10 par value, respectively; 50,000 and 100 shares authorized, respectively; 0 and 100 issued and outstanding, respectively | $ |  |  |  | $ 15 |  | $ 0 |  | $ 15 | $ 15 |  |
Preferred Stock, Redemption Price Per Share | £ / shares |  |  |  |  |  |  |  |  |  | £ 0.10 |
Value (EUROS) Ordinary Shares Deferred | € |  |  |  |  |  |  | € 25,000 |  |  |  |
Weighted Average Number of Shares Outstanding, Basic |  | 84,577,000 | 85,028,000 | 85,473,000 |  |  |  |  |  |  |
Weighted Average Number Diluted Shares Outstanding Adjustment |  | 891,000 | 685,000 | 621,000 |  |  |  |  |  |  |
Weighted Average Number of Shares Outstanding, Diluted |  | 85,468,000 | 85,713,000 | 86,094,000 |  |  |  |  |  |  |
Stock Options [Member] |  |  |  |  |  |  |  |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |  |  |  |  |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount |  | 352,000 | 393,000 | 576,000 |  |  |  |  |  |  |
United Kingdom, Pounds |  |  |  |  |  |  |  |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |  |  |  |  |  |  |  |
Preferred Stock, Par or Stated Value Per Share | £ / shares |  |  |  |  |  |  |  |  |  | £ 0.10 |
United States of America, Dollars |  |  |  |  |  |  |  |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |  |  |  |  |  |  |  |
Preferred shares, with $0.001 and £0.10 par value, respectively; 50,000 and 100 shares authorized, respectively; 0 and 100 issued and outstanding, respectively | $ |  |  |  |  |  |  |  |  |  |  | $ 15

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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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