Share-Based Compensation (Summary of Option Activity) (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2019
Number of Options
Beginning balance (in shares)	7,723,302
Granted (in shares)	1,985,765
Exercised (in shares)	(905,776)
Forfeited (in shares)	(509,960)
Ending balance (in shares)	8,293,331	7,723,302
Weighted Average Exercise Price
Beginning balance (in USD per share)	$ 9.25
Granted (in USD per share)	10.88
Exercised (in USD per share)	7.41
Forfeited (in USD per share)	8.32
Ending balance (in USD per share)	$ 9.90	$ 9.25
Options Vested and Expected to Vest
Number of Options (in shares)	8,293,331
Weighted Average Exercise Price (in USD per share)	$ 9.90
Weighted Average Remaining Contractual Life (in years)	6 years 5 months 23 days
Aggregate Intrinsic Value (in thousands)	$ 90,699
Additional Information
Options outstanding, Weighted Average Remaining Contractual Life	6 years 5 months 23 days	8 years 29 days
Options outstanding, Aggregate Intrinsic Value	$ 90,699	$ 4,146
Options exercisable, Number of Options (in shares)	5,219,403	3,009,080	1,581,810
Options exercisable, Weighted Average Exercise Price (in USD per share)	$ 9.77
Options exercisable, Weighted Average Remaining Contractual Life	5 years 3 months 3 days
Intrinsic value of options exercised	$ 58,419

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The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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Number of options outstanding, including both vested and non-vested options.

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Amount by which current fair value of underlying stock exceeds exercise price of fully vested and expected to vest options outstanding. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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