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Goodwill - Schedule of Changes in Carrying Amount of Goodwill (Detail)
¥ in Thousands, $ in Thousands
12 Months Ended
Mar. 31, 2020
CNY (¥)
Mar. 31, 2021
CNY (¥)
Mar. 31, 2021
USD ($)
Mar. 31, 2019
CNY (¥)
Goodwill [Line Items]        
Goodwill, Gross ¥ 1,664,889 ¥ 1,664,889   ¥ 1,664,889
Goodwill, Impaired, Accumulated Impairment Loss (1,478,385) (1,478,385)   (96,236)
Goodwill 186,504 186,504 $ 28,466 1,568,653
Transaction during the year        
Goodwill impairment recognized during the year (1,382,149)      
Goodwill, Gross, Ending balance 1,664,889      
Accumulated impairment loss, Ending balance (1,478,385)      
Goodwill, Net, Ending balance 186,504      
Cross-border Business        
Goodwill [Line Items]        
Goodwill, Gross 96,236 96,236   96,236
Goodwill, Impaired, Accumulated Impairment Loss (96,236) (96,236)   (96,236)
Transaction during the year        
Goodwill, Gross, Ending balance 96,236      
Accumulated impairment loss, Ending balance (96,236)      
Domestic Business        
Goodwill [Line Items]        
Goodwill, Gross 1,568,653 1,568,653   1,568,653
Goodwill, Impaired, Accumulated Impairment Loss (1,382,149) (1,382,149)    
Goodwill 186,504 ¥ 186,504   ¥ 1,568,653
Transaction during the year        
Goodwill impairment recognized during the year [1] (1,382,149)      
Goodwill, Gross, Ending balance 1,568,653      
Accumulated impairment loss, Ending balance (1,382,149)      
Goodwill, Net, Ending balance ¥ 186,504      
[1] Goodwill impairment