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Summary of Significant Accounting Policies, Share-Based Payments (Details) - $ / shares	12 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2017
Black-Scholes option pricing model assumptions used to derive the weighted average fair value of the stock options granted [Abstract]
Weighted average risk free interest rate	2.83%	1.92%	1.39%
Weighted average expected holding period	5 years 11 months 8 days	5 years 9 months 25 days	5 years 10 months 2 days
Weighted average expected volatility	43.91%	47.28%	47.42%
Weighted average expected dividend yield	0.00%	0.00%	0.00%
Weighted average fair value of options granted (in dollars per share)	$ 8.75	$ 12.63	$ 13.09

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No definition available.

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The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (f)(2)(iii)
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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.

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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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The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

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Expected term of share-based compensation awards, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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