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Share-Based Compensation (Stock Option Valuation Assumptions) (Details) - Stock Options - USD ($)	6 Months Ended
	Sep. 30, 2019	Sep. 30, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected volatility		29.60%
Expected dividends	$ 0	$ 0
Expected term in years		6 years
Risk-free rate		2.90%
Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award exercisability period, from date of grant	10 years
Expected volatility	31.30%
Expected term in years	7 years
Risk-free rate	2.40%
Award vesting period	5 years
Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected volatility	30.90%
Expected term in years	6 years
Risk-free rate	2.30%
Award vesting period	3 years

X

- Definition

Share-based Compensation Arrangement by Share-based Payment Award, Award Exercisability Period, from Date of Grant

+ References

No definition available.

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- Definition

Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)(1)
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- Definition

The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period.

+ References

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-SubTopic 10
-Section 50
-Paragraph 2
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The risk-free interest rate assumption that is used in valuing an option on its own shares.

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- Definition

Disclosure of the weighted average expected dividend for an entity using a valuation technique with different dividend rates during the contractual term.

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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

Expected term of award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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