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Restricted Net Assets - Additional Information (Detail) - CNY (¥)
¥ in Thousands
12 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Mar. 31, 2019
Restricted Net Assets [Line Items]      
Minimum percentage, appropriation to the statutory surplus fund of the after-tax profits 10.00%    
Maximum percentage of the registered capital where appropriation is not required 50.00%    
Amount of restricted net assets of consolidated and unconsolidated subsidiaries ¥ 5,176,138 ¥ 5,144,642  
Statutory Reserves      
Restricted Net Assets [Line Items]      
Appropriations to statutory surplus fund and other reserve funds ¥ 701 ¥ 155 ¥ 496