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Significant mergers and acquisitions and investments - Sun Art (Details) ¥ in Millions, $ in Millions, $ in Billions | 1 Months Ended | 12 Months Ended | 15 Months Ended |  |
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Dec. 31, 2020 CNY (¥) | Dec. 31, 2020 HKD ($) | Oct. 31, 2020 CNY (¥) | Oct. 31, 2020 USD ($) | Mar. 31, 2022 CNY (¥) | Mar. 31, 2022 USD ($) | Mar. 31, 2021 CNY (¥) | Mar. 31, 2020 CNY (¥) | Dec. 31, 2019 CNY (¥) | Mar. 31, 2021 CNY (¥) | Mar. 31, 2022 USD ($) | Sep. 30, 2020
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Cash consideration |  |  |  |  | ¥ 5,282.0 |  | ¥ 27,014.0 | ¥ 16,022.0 |  |  |  |
The allocation of the purchase price at the date of acquisition |  |  |  |  |  |  |  |  |  |  |  |
Goodwill |  |  |  |  | 269,581.0 |  | 292,771.0 | 276,782.0 |  | ¥ 292,771.0 | $ 42,525 |
Total purchase price is comprised of: |  |  |  |  |  |  |  |  |  |  |  |
- cash consideration |  |  |  |  | 5,282.0 |  | 27,014.0 | 16,022.0 |  |  |  |
Revenue |  |  |  |  | 853,062.0 | $ 134,567 | 717,289.0 | 509,711.0 |  |  |  |
Net income |  |  |  |  | ¥ 47,079.0 | $ 7,427 | 143,284.0 | ¥ 140,350.0 |  |  |  |
Sun Art Retail Group Limited |  |  |  |  |  |  |  |  |  |  |  |
Total purchase price is comprised of: |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | ¥ 95,400.0 | 124,300.0 |  |
Net income |  |  |  |  |  |  |  |  | ¥ 3,000.0 | ¥ 3,800.0 |  |
Trade names, trademarks and domain names | Maximum |  |  |  |  |  |  |  |  |  |  |  |
Total purchase price is comprised of: |  |  |  |  |  |  |  |  |  |  |  |
Estimated amortization periods |  |  |  |  | 20 years | 20 years |  |  |  |  |  |
Non-compete agreements | Maximum |  |  |  |  |  |  |  |  |  |  |  |
Total purchase price is comprised of: |  |  |  |  |  |  |  |  |  |  |  |
Estimated amortization periods |  |  |  |  | 10 years | 10 years |  |  |  |  |  |
Developed technology and patents | Maximum |  |  |  |  |  |  |  |  |  |  |  |
Total purchase price is comprised of: |  |  |  |  |  |  |  |  |  |  |  |
Estimated amortization periods |  |  |  |  | 7 years | 7 years |  |  |  |  |  |
User base and customer relationships | Maximum |  |  |  |  |  |  |  |  |  |  |  |
Total purchase price is comprised of: |  |  |  |  |  |  |  |  |  |  |  |
Estimated amortization periods |  |  |  |  | 16 years | 16 years |  |  |  |  |  |
Sun Art Retail Group Limited |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Equity interest held in subsidiary (as a percentage) | 74.00% | 74.00% |  |  |  |  |  |  |  |  |  |
Sun Art Retail Group Limited |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Cash consideration |  |  | ¥ 24,136.0 | $ 3,600 |  |  |  |  |  |  |  |
Equity interest in consolidated subsidiary (as a percent) |  |  | 67.00% |  |  |  |  |  |  |  |  |
The allocation of the purchase price at the date of acquisition |  |  |  |  |  |  |  |  |  |  |  |
Net assets acquired |  |  | ¥ 49,672.0 |  |  |  |  |  |  |  |  |
Goodwill |  |  | 13,474.0 |  |  |  |  |  |  |  |  |
Deferred tax liabilities |  |  | (9,629.0) |  |  |  |  |  |  |  |  |
Noncontrolling interests |  |  | (23,684.0) |  |  |  |  |  |  |  |  |
Total |  |  | 46,695.0 |  |  |  |  |  |  |  |  |
Total purchase price is comprised of: |  |  |  |  |  |  |  |  |  |  |  |
- cash consideration |  |  | 24,136.0 | $ 3,600 |  |  |  |  |  |  |  |
- fair value of previously held equity interests |  |  | 22,559.0 |  |  |  |  |  |  |  |  |
Total |  |  | 46,695.0 |  |  |  |  |  |  |  |  |
Property and equipment |  |  | 27,333.0 |  |  |  |  |  |  |  |  |
Operating lease right-of-use assets relating to land use rights |  |  | 22,997.0 |  |  |  |  |  |  |  |  |
Payables and accruals for cost of revenue |  |  | 14,681.0 |  |  |  |  |  |  |  |  |
Short-term investments |  |  | 14,387.0 |  |  |  |  |  |  |  |  |
Customer advances |  |  | 11,082.0 |  |  |  |  |  |  |  |  |
Inventories |  |  | ¥ 9,341.0 |  |  |  |  |  |  |  |  |
Weighted average amortization period |  |  | 11 years 9 months 18 days | 11 years 9 months 18 days |  |  |  |  |  |  |  |
Gain recognized in relation to the revaluation of previously held equity interest relating to obtaining control |  |  |  |  |  |  | 6,381.0 |  |  |  |  |
Revenue |  |  |  |  |  |  | ¥ 42,900.0 |  |  |  |  |
Cash consideration for additional equity interest acquired | ¥ 4,100.0 | $ 4.9 |  |  |  |  |  |  |  |  |  |
Reduction of noncontrolling interest | ¥ 4,592.0 |  |  |  |  |  |  |  |  |  |  |
Sun Art Retail Group Limited | Maximum |  |  |  |  |  |  |  |  |  |  |  |
Total purchase price is comprised of: |  |  |  |  |  |  |  |  |  |  |  |
Estimated amortization periods |  |  | 13 years | 13 years |  |  |  |  |  |  |  |
Sun Art Retail Group Limited | Trade names, trademarks and domain names |  |  |  |  |  |  |  |  |  |  |  |
The allocation of the purchase price at the date of acquisition |  |  |  |  |  |  |  |  |  |  |  |
Amortizable intangible assets |  |  | ¥ 11,500.0 |  |  |  |  |  |  |  |  |
Sun Art Retail Group Limited | Non-compete agreements |  |  |  |  |  |  |  |  |  |  |  |
The allocation of the purchase price at the date of acquisition |  |  |  |  |  |  |  |  |  |  |  |
Amortizable intangible assets |  |  | 4,700.0 |  |  |  |  |  |  |  |  |
Sun Art Retail Group Limited | Developed technology and patents |  |  |  |  |  |  |  |  |  |  |  |
The allocation of the purchase price at the date of acquisition |  |  |  |  |  |  |  |  |  |  |  |
Amortizable intangible assets |  |  | 615.0 |  |  |  |  |  |  |  |  |
Sun Art Retail Group Limited | User base and customer relationships |  |  |  |  |  |  |  |  |  |  |  |
The allocation of the purchase price at the date of acquisition |  |  |  |  |  |  |  |  |  |  |  |
Amortizable intangible assets |  |  | ¥ 47.0 |  |  |  |  |  |  |  |  |
Sun Art Retail Group Limited |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Equity interest (as a percent) |  |  |  |  |  |  |  |  |  |  |  | 31.00%

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