v3.26.1
Taxation - Reconciliation of Difference Between the PRC Statutory Income Tax Rate and Effective Tax Rate (Detail)
$ in Thousands
12 Months Ended
Mar. 31, 2026
CNY (¥)
Mar. 31, 2026
USD ($)
Mar. 31, 2025
CNY (¥)
Mar. 31, 2024
CNY (¥)
Mar. 31, 2020
Effective Income Tax Rate Reconciliation [Line Items]          
Income before income tax, percent 100.00% 100.00%      
PRC Statutory tax rate, percent 25.00% 25.00% 25.00% 25.00% 25.00%
Difference in EIT rates of certain subsidiaries, percent     (24.00%) (11.00%)  
Permanent book - tax difference, percent     (4.00%) (8.00%)  
Computed income tax expense with PRC statutory income tax rate, percent 25.00% 25.00%      
Additional deduction for research and development expenditures, percent     5.00% 6.00%  
Effect of change on tax rate, percent     0.00% (5.00%)  
Changes in valuation allowance, percent     (3.00%) (5.00%)  
Effective tax rate, percent 66.00% 66.00% (1.00%) 2.00%  
Income before income tax ¥ 9,349,000        
Computed income tax expense with PRC statutory income tax rate (2,338,000)        
Total income tax benefit/(expense) (6,129,000) $ (889) ¥ (839,000) ¥ 1,618,000  
PRC          
Effective Income Tax Rate Reconciliation [Line Items]          
Total income tax benefit/(expense) (5,715,000)   (772,000) 1,618,000  
Hong Kong          
Effective Income Tax Rate Reconciliation [Line Items]          
Total income tax benefit/(expense) (414,000)   (67,000) 0  
Cayman          
Effective Income Tax Rate Reconciliation [Line Items]          
Total income tax benefit/(expense) ¥ 0   ¥ 0 ¥ 0  
Domestic Tax Jurisdiction [Member] | PRC          
Effective Income Tax Rate Reconciliation [Line Items]          
Additional deduction for research and development expenditures, percent (49.00%) (49.00%)      
Non-deductible entertainment expense, percent 3.00% 3.00%      
Changes in tax rates enacted in the current period, percent 586.00% 586.00%      
Non-taxable deconsolidation gain, percent (59.00%) (59.00%)      
Deconsolidation, percent 14.00% 14.00%      
Preferential tax rate, percent 45.00% 45.00%      
Expired NOL, percent 209.00% 209.00%      
Changes in valuation allowance, percent (705.00%) (705.00%)      
Other adjustments, percent 0.00% 0.00%      
Additional deduction of qualified R&D expenditures ¥ 4,572,000        
Non-deductible entertainment expense (263,000)        
Changes in valuation allowance 66,052,000        
Changes in tax rates enacted in the current period (54,792,000)        
Non-taxable deconsolidation gain 5,500,000        
Deconsolidation (1,302,000)        
Preferential tax rate (4,206,000)        
Expired NOL (19,546,000)        
Other adjustments ¥ (8,000)        
Foreign Tax Jurisdiction [Member] | Hong Kong          
Effective Income Tax Rate Reconciliation [Line Items]          
Statutory tax rate difference, percent (4.00%) (4.00%)      
Preferential tax rate, percent (2.00%) (2.00%)      
Changes in valuation allowance, percent 6.00% 6.00%      
Changes in valuation allowance ¥ (548,000)        
Statutory tax rate difference 367,000        
Preferential tax rate ¥ 148,000        
Foreign Tax Jurisdiction [Member] | Cayman          
Effective Income Tax Rate Reconciliation [Line Items]          
Statutory tax rate difference, percent (3.00%) (3.00%)      
Statutory tax rate difference ¥ 235,000