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Significant equity transactions, mergers and acquisitions and investments - China Broadcasting Network (Details) - China Broadcasting Network ¥ in Billions	3 Months Ended
	Dec. 31, 2020 CNY (¥)
Significant equity transaction, mergers and acquisitions and investments
Total consideration	¥ 10.0
Percentage of equity interest acquired	7.00%

X

- Definition

The percentage of ownership of common stock or equity participation in the investee acquired during the period.

+ References

No definition available.

+ Details

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Namespace Prefix:	baba_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The cash outflow associated with the purchase of all investments (debt, security, other) during the period.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 13
-URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3213-108585

+ Details

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Balance Type:	credit
Period Type:	duration

X

- 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.

+ Details

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Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis=baba_ChinaBroadcastingNetworkJointStockCorporationLimitedMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: