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Share-based awards- Partner Capital Investment Plan (Details) ¥ in Millions | 6 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Sep. 30, 2020 CNY (¥) shares | Sep. 30, 2019 CNY (¥) | Mar. 31, 2020 $ / shares shares | Mar. 31, 2019 $ / shares shares | Mar. 31, 2018 $ / shares shares | Mar. 31, 2017 $ / shares shares | Mar. 31, 2016 $ / shares shares | Dec. 31, 2015 $ / shares shares | Dec. 31, 2014 $ / shares shares | Dec. 31, 2013 $ / shares shares | Sep. 30, 2020 $ / shares
Share-based awards |  |  |  |  |  |  |  |  |  |  |
Number of shares underlying available for offering | 299,872,568 |  |  |  |  |  |  |  |  |  |
Share-based compensation expense | ¥ | ¥ 32,409 | ¥ 15,260 |  |  |  |  |  |  |  |  |
Partner Capital Investment Plan relating to ordinary shares of the Company | Subscription rights |  |  |  |  |  |  |  |  |  |  |
Share-based awards |  |  |  |  |  |  |  |  |  |  |
Number of restricted shares each right entitles the holder to purchase after the Share Subdivision | 8 |  | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 |
Agreed-upon exercise price | $ / shares |  |  |  |  |  |  |  | $ 14.50 | $ 14.50 | $ 14.50 |
Subscription period | 10 years |  | 10 years | 10 years | 10 years | 10 years | 10 years | 4 years | 4 years | 4 years |
Restriction period for the transfer shares |  |  |  |  |  |  |  | 8 years | 8 years | 8 years |
Number of shares underlying | 144,000,000 |  |  |  |  |  |  |  |  |  |
Number of shares underlying available for offering | 18,660,976 |  |  |  |  |  |  |  |  |  |
Unamortized compensation costs | ¥ | ¥ 559 |  |  |  |  |  |  |  |  |  |
Weighted average period over which unamortized compensation costs expected be recognized | 4 years 2 months 12 days |  |  |  |  |  |  |  |  |  |
Partner Capital Investment Plan relating to ordinary shares of the Company | Subscription rights | Before the Share Subdivision |  |  |  |  |  |  |  |  |  |  |
Share-based awards |  |  |  |  |  |  |  |  |  |  |
Number of shares underlying | 18,000,000 |  |  |  |  |  |  |  |  |  |
Number of shares underlying available for offering | 2,332,622 |  |  |  |  |  |  |  |  |  |
Partner Capital Investment Plan relating to ordinary shares of the Company | Subscription rights | Minimum |  |  |  |  |  |  |  |  |  |  |
Share-based awards |  |  |  |  |  |  |  |  |  |  |
Agreed-upon exercise price | $ / shares |  |  | $ 23.00 | $ 23.00 | $ 23.00 | $ 23.00 | $ 23.00 |  |  |  | $ 23.00
Partner Capital Investment Plan relating to ordinary shares of the Company | Subscription rights | Maximum |  |  |  |  |  |  |  |  |  |  |
Share-based awards |  |  |  |  |  |  |  |  |  |  |
Agreed-upon exercise price | $ / shares |  |  | $ 26.00 | $ 26.00 | $ 26.00 | $ 26.00 | $ 26.00 |  |  |  | $ 26.00

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- Definition Period over which subscription rights at the subscription price can be exercised, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition Period over which underlying ordinary shares may not be transferred from the date of subscription of the relevant rights, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition Amount of expense for award under share-based payment arrangement. Excludes amount capitalized. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5047-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -URI http://asc.fasb.org/extlink&oid=115993241&loc=d3e301413-122809 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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