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Fair value measurements - Summary of Roll Forward of Major Level 3 Investments (Detail) - CNY (¥)
¥ in Thousands
12 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Mar. 31, 2021
Available-for-sale Securities [Member]      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Disposal of Series D-3 Notes ¥ (428)    
Fair value of Level 3 investments , Beginning Balance 74,866 ¥ 71,357 ¥ 70,328
New addition   16,000  
Unrealized fair value change of the available-for-sale debt investments (6,427) (12,491) 1,029
Fair value of Level 3 investments , Ending Balance 68,011 74,866 71,357
Derivative Financial Instruments, Liabilities [Member]      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Fair value of Level 3 investments, Beginning Balance 9,086 9,996 14,351
New addition     9,581
Disposal of Series D-3 Notes     (2,377)
Reclassification of forward exchange contracts (651) 746  
Unrealized fair value change of the derivative liabilities 2,266 (1,656) (11,559)
Fair value of Level 3 investments , Ending Balance ¥ 10,701 ¥ 9,086 ¥ 9,996