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Investments - Summary of Gain from Investment Disposal (Detail)
¥ in Thousands, $ in Thousands
12 Months Ended
Nov. 20, 2018
USD ($)
Nov. 20, 2018
CNY (¥)
Mar. 31, 2020
USD ($)
Mar. 31, 2020
CNY (¥)
Mar. 31, 2021
CNY (¥)
Mar. 31, 2018
CNY (¥)
Schedule of Investments [Line Items]            
Cash consideration collected     $ 951 ¥ 6,566    
Less: Carrying value of investment as at November 20, 2018       (102,373) ¥ (51,346)  
Huzan Inc.            
Schedule of Investments [Line Items]            
Cash consideration collected $ 5,172 ¥ 35,501        
Less: Carrying value of investment as at November 20, 2018   (13,658)   ¥ (10,996) ¥ (1,686) ¥ (14,021)
Add: Realized gain in other comprehensive income   9,393        
Gain from investment disposal   ¥ 31,236