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Shares and Preferred Shares Ordinary Shares (Details)	3 Months Ended		6 Months Ended
	Sep. 30, 2020 $ / shares shares	Sep. 30, 2019 shares	Sep. 30, 2020 $ / shares shares	Sep. 30, 2019 shares	Sep. 30, 2020 EUR (€) shares	Mar. 31, 2020 $ / shares
Weighted Average Number of Shares Outstanding Reconciliation [Abstract]
Weighted average shares outstanding - basic	85,170,000	84,795,000	85,065,000	84,716,000
Dilutive effect of share equivalents	674,000	900,000	695,000	914,000
Weighted average shares outstanding and share equivalents - diluted	85,844,000	85,695,000	85,760,000	85,630,000
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Preferred Stock, Shares Authorized					50,000,000
Common Stock, Par or Stated Value Per Share | $ / shares	$ 0.001		$ 0.001			$ 0.001
Preferred Stock, Par or Stated Value Per Share | $ / shares	$ 0.001		$ 0.001
Deferred Ordinary Shares					25,000
Employee share option
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Number of share options that are antidilutive	503,000	341,000	416,000	231,000
Euro Member Countries, Euro
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Par Value (Euros) of Deferred Ordinary Shares | €					€ 1.00

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Par Value (Euros) of Deferred Ordinary Shares

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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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Face amount or stated value per share of common stock.

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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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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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