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Parent Company Only Condensed Financial Information - Condensed Balance Sheets (Parenthetical) (Detail) - $ / shares
Mar. 31, 2021
Mar. 31, 2020
Mar. 31, 2019
Dec. 09, 2018
Mar. 31, 2018
May 24, 2013
Condensed Financial Statements, Captions [Line Items]            
Ordinary shares, par value           $ 0.00001
Ordinary shares, authorized       50,000,000,000 3,263,949,065  
Treasury stock par value $ 0.00001 $ 0.00001        
Treasury stock shares 216,972,050 10,456,075        
Class A Ordinary Shares            
Condensed Financial Statements, Captions [Line Items]            
Ordinary shares, par value $ 0.00001 $ 0.00001   $ 0.00001    
Ordinary shares, authorized 49,000,000,000 49,000,000,000   49,000,000,000    
Ordinary shares, shares issued 2,432,015,450 2,418,910,250 2,371,289,450   335,534,850  
Ordinary shares, shares outstanding 2,215,043,400 2,408,454,175 2,371,289,450   335,534,850  
Class B Ordinary Shares            
Condensed Financial Statements, Captions [Line Items]            
Ordinary shares, par value $ 0.00001 $ 0.00001   $ 0.00001    
Ordinary shares, authorized 500,000,000 500,000,000   500,000,000    
Ordinary shares, shares issued 303,234,004 303,234,004 303,234,004      
Ordinary shares, shares outstanding 303,234,004 303,234,004 303,234,004      
Parent Company            
Condensed Financial Statements, Captions [Line Items]            
Treasury stock par value $ 0.00001 $ 0.00001        
Treasury stock shares 216,972,050 10,456,075        
Parent Company | Class A Ordinary Shares            
Condensed Financial Statements, Captions [Line Items]            
Ordinary shares, par value $ 0.00001 $ 0.00001        
Ordinary shares, authorized 49,000,000,000 49,000,000,000        
Ordinary shares, shares issued 2,432,015,450 2,418,910,250        
Ordinary shares, shares outstanding 2,215,043,400 2,408,454,175        
Parent Company | Class B Ordinary Shares            
Condensed Financial Statements, Captions [Line Items]            
Ordinary shares, par value $ 0.00001 $ 0.00001        
Ordinary shares, authorized 500,000,000 500,000,000        
Ordinary shares, shares issued 303,234,004 303,234,004        
Ordinary shares, shares outstanding 303,234,004 303,234,004