Value (EUROS) Ordinary Shares Deferred

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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.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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- Definition

Face amount or stated value per share of common stock.

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- Definition

Aggregate par or stated value of issued nonredeemable common stock (or common stock redeemable solely at the option of the issuer). This item includes treasury stock repurchased by the entity. Note: elements for number of nonredeemable common shares, par value and other disclosure concepts are in another section within stockholders' equity.

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- Definition

The percentage rate used to calculate dividend payments on preferred stock.

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No definition available.

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Face amount or stated value per share of preferred stock nonredeemable or redeemable solely at the option of the issuer.

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- Definition

The price per share at which the preferred stock of an entity that has priority over common stock in the distribution of dividends and in the event of liquidation of the entity is redeemed or may be called at. The redemption features of this preferred stock are solely within the control of the issuer.

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Total number of nonredeemable preferred shares (or preferred stock redeemable solely at the option of the issuer) issued to shareholders (includes related preferred shares that were issued, repurchased, and remain in the treasury). May be all or portion of the number of preferred shares authorized. Excludes preferred shares that are classified as debt.

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Aggregate par or stated value of issued nonredeemable preferred stock (or preferred stock redeemable solely at the option of the issuer). This item includes treasury stock repurchased by the entity. Note: elements for number of nonredeemable preferred shares, par value and other disclosure concepts are in another section within stockholders' equity.

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The sum of dilutive potential common shares or units used in the calculation of the diluted per-share or per-unit computation.

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The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period.

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Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period.

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Common Shares (Details) $ / shares in Units, $ in Thousands	3 Months Ended	12 Months Ended
Common Shares (Details) $ / shares in Units, $ in Thousands	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