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Loss Per Share - Schedule of Calculation of Basic and Diluted Loss Per Share (Detail) ¥ / shares in Units, ¥ in Thousands, $ in Thousands	12 Months Ended
	Mar. 31, 2021 CNY (¥) ¥ / shares shares	Mar. 31, 2021 USD ($) shares	Mar. 31, 2020 CNY (¥) ¥ / shares shares	Mar. 31, 2019 CNY (¥) ¥ / shares shares
Numerator:
Net loss	¥ (327,971)	$ (50,059)	¥ (2,223,638)	¥ (486,275)
Accretion of convertible redeemable preferred shares to redemption value				(509,904)
Deemed dividends to preferred shareholders				(89,076)
Net loss attributable to ordinary shareholders-Basic and Diluted	¥ (327,971)	$ (50,059)	¥ (2,223,638)	¥ (1,085,255)
Denominator:
Weighted average number of ordinary shares-Basic and Diluted | shares	2,630,425,361	2,630,425,361	2,718,827,977	1,247,998,533
Basic and diluted loss per share | ¥ / shares	¥ (0.12)		¥ (0.82)	¥ (0.87)

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The amount of net income or loss for the period per each share in instances when basic and diluted earnings per share are the same amount and reported as a single line item on the face of the financial statements. Basic earnings per share is the amount of net income or loss for the period per each share of common stock or unit outstanding during the reporting period. Diluted earnings per share includes the amount of net income or loss for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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