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Restricted net assets (Details)
¥ in Millions
12 Months Ended
Mar. 31, 2025
CNY (¥)
Restrictions for Consolidated and Unconsolidated Subsidiaries [Abstract]  
Percentage of net income from subsidiaries and consolidated VIEs incorporated in the PRC to be appropriated to the statutory reserve 10.00%
Limit of statutory reserve fund as a percentage of registered capital, after which allocations to statutory reserve fund are no longer required 50.00%
Restricted net assets ¥ 334,791