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Share Based Compensation - Summary of Activities of Service-based RSU (Detail) - Restricted Stock Units (RSUs) - $ / shares	12 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2019
Number of RSUs
Number of RSUs, Unvested Beginning balance	50,365,952	68,283,127	4,895,060
Number of RSUs, Granted	42,695,000	53,563,150	78,715,557
Number of RSUs, Vested	(8,195,402)	(18,466,165)	(6,114,640)
Number of RSUs, Forfeited	(14,092,450)	(53,014,160)	(9,212,850)
Number of RSUs, Unvested Ending balance	70,773,100	50,365,952	68,283,127
Weighted-Average Grant-Date Fair Value
Weighted-Average Grant-Date Fair Value, Unvested Beginning balance	$ 0.31	$ 0.66	$ 0.45
Weighted-Average Grant-Date Fair Value, Granted	0.05	0.23	0.67
Weighted-Average Grant-Date Fair Value, Vested	0.62	0.65	0.63
Weighted-Average Grant-Date Fair Value, Forfeited	0.51	0.56	0.64
Weighted-Average Grant-Date Fair Value, Unvested Ending balance	$ 0.08	$ 0.31	$ 0.66

X

- Definition

The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
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- Definition

Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event.

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- Definition

The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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- Definition

The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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- Definition

The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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Per share or unit weighted-average fair value of nonvested award under share-based payment arrangement. Excludes share and unit options.

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The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

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The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement.

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