Interest expense (Tables)

12 Months Ended

Mar. 31, 2021

Interest and Debt Expense [Abstract]

Summary of Interest Expense

	Year ended March 31, 2019		Year ended March 31, 2020		Year ended March 31, 2021
	RMB		RMB		RMB
Amortization charges on promissory notes		17,077		56,290		21,611
Interest expense on borrowings		1,453		2,815		6,039
Others		124		163		—
Total		18,654		59,268		27,650