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Risks and contingencies (Details) - CNY (¥) ¥ in Millions	6 Months Ended
	Sep. 30, 2020	Sep. 30, 2019
Collectability of payments made relating to trade assurance program
Risks and contingencies
Provisions made in relation to the program	¥ 0	¥ 0

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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- Definition

Amount charged against operating income increasing loss contingency liability, after adjustments to reduce previously estimated charges.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=118942415&loc=d3e14326-108349

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