v3.26.1
Taxation - Composition of Income Taxes Benefits (Detail)
$ in Thousands
 12 Months Ended
Mar. 31, 2026
CNY (¥)
Mar. 31, 2026
USD ($)
Mar. 31, 2025
CNY (¥)
Mar. 31, 2024
CNY (¥)
Income Tax Benefit (Expense) [Line Items]        
Current income tax expense ¥ (6,129,000)   ¥ (839,000) ¥ (137,000)
Deferred income tax benefit 0 $ 0 0 1,755,000
Total income tax benefit/(expense) (6,129,000) $ (889) (839,000) 1,618,000
PRC        
Income Tax Benefit (Expense) [Line Items]        
Current income tax expense (5,715,000)   (772,000) (137,000)
Deferred income tax benefit 0   0 1,755,000
Total income tax benefit/(expense) (5,715,000)   (772,000) 1,618,000
Hong Kong        
Income Tax Benefit (Expense) [Line Items]        
Current income tax expense (414,000)   (67,000) 0
Deferred income tax benefit 0   0 0
Total income tax benefit/(expense) (414,000)   (67,000) 0
Cayman        
Income Tax Benefit (Expense) [Line Items]        
Current income tax expense 0   0 0
Deferred income tax benefit 0   0 0
Total income tax benefit/(expense) ¥ 0   ¥ 0 ¥ 0