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Significant equity transactions, restructuring transactions, mergers and acquisitions and equity investments- Youku Tudou (Details) $ / shares in Units, ¥ in Millions, shares in Millions, $ in Millions | 1 Months Ended | 12 Months Ended |  |
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Apr. 30, 2017 shares | Apr. 30, 2016 USD ($) $ / shares | Apr. 30, 2016 CNY (¥) | May 31, 2014 USD ($) director | May 31, 2014 CNY (¥) director | Mar. 31, 2017 CNY (¥) | Mar. 31, 2016 CNY (¥) | Mar. 31, 2015 CNY (¥) | Mar. 31, 2017 USD ($) | Mar. 31, 2017 CNY (¥) | Apr. 30, 2016 CNY (¥)
The allocation of the purchase price at the date of acquisition |  |  |  |  |  |  |  |  |  |  |
Goodwill |  |  |  |  |  |  | ¥ 81,645 | ¥ 41,933 | $ 18,221 | ¥ 125,420 |
Licensed Copyrights of Video Content |  |  |  |  |  |  |  |  |  | ¥ 327 |
Total purchase price comprised of: |  |  |  |  |  |  |  |  |  |  |
- cash consideration |  |  | ¥ 28,724 |  |  | ¥ 41,836 | ¥ 3,055 | ¥ 16,291 |  |  |
- fair value of previously held equity interests |  |  | 6,376 |  |  |  |  |  |  |  |
Total |  |  | 35,100 |  |  |  |  |  |  |  |
Youku Tudou |  |  |  |  |  |  |  |  |  |  |
Acquisition |  |  |  |  |  |  |  |  |  |  |
Number of director appointed to investee | director |  |  |  | 1 | 1 |  |  |  |  |  |
Trade names, trademarks and domain names | Maximum |  |  |  |  |  |  |  |  |  |  |
Total purchase price comprised of: |  |  |  |  |  |  |  |  |  |  |
Estimated amortization periods |  |  |  |  |  | 20 years |  |  |  |  |
User base and customer relationships | Maximum |  |  |  |  |  |  |  |  |  |  |
Total purchase price comprised of: |  |  |  |  |  |  |  |  |  |  |
Estimated amortization periods |  |  |  |  |  | 6 years |  |  |  |  |
Developed technology and patents | Maximum |  |  |  |  |  |  |  |  |  |  |
Total purchase price comprised of: |  |  |  |  |  |  |  |  |  |  |
Estimated amortization periods |  |  |  |  |  | 5 years |  |  |  |  |
Youku Tudou |  |  |  |  |  |  |  |  |  |  |
Acquisition |  |  |  |  |  |  |  |  |  |  |
Equity interest held in subsidiary (as a percentage) |  |  |  |  |  |  |  |  |  |  | 98.00%
Minority interest (as a percent) |  |  |  |  |  |  |  |  |  |  | 2.00%
The allocation of the purchase price at the date of acquisition |  |  |  |  |  |  |  |  |  |  |
Net assets acquired |  |  |  |  |  |  |  |  |  |  | ¥ 5,836
Goodwill |  |  |  |  |  |  |  |  |  |  | 26,395
Deferred tax assets |  |  |  |  |  |  |  |  |  |  | 73
Deferred tax liabilities |  |  |  |  |  |  |  |  |  |  | (1,167)
Noncontrolling interests |  |  |  |  |  |  |  |  |  |  | (773)
Total |  |  |  |  |  |  |  |  |  |  | 35,100
Total purchase price comprised of: |  |  |  |  |  |  |  |  |  |  |
- cash consideration |  | $ 4,443 | ¥ 28,724 |  |  |  |  |  |  |  |
Cash and cash equivalents and short-term interest-bearing deposits |  |  |  |  |  |  |  |  |  |  | 5,857
Weighted average amortization period |  | 17 years 4 months 24 days | 17 years 4 months 24 days |  |  |  |  |  |  |  |
Gain recognized in relation to the revaluation of previously held equity interest relating to the step acquisition |  |  |  |  |  | ¥ 518 |  |  |  |  |
Maximum percentage available to be purchased by the former management and shareholders |  | 15.00% | 15.00% |  |  |  |  |  |  |  |
Issuance of ordinary shares to settle options (in shares) | shares | 1.3 |  |  |  |  |  |  |  |  |  |
Restricted share units issued to settle options and contain vesting conditions pursuant to a non compete agreement (in shares) | shares | 3.4 |  |  |  |  |  |  |  |  |  |
Youku Tudou | Maximum |  |  |  |  |  |  |  |  |  |  |
Total purchase price comprised of: |  |  |  |  |  |  |  |  |  |  |
Estimated amortization periods |  | 20 years | 20 years |  |  |  |  |  |  |  |
Youku Tudou | ADS |  |  |  |  |  |  |  |  |  |  |
Acquisition |  |  |  |  |  |  |  |  |  |  |
Purchase price (in USD per share) | $ / shares |  | $ 27.60 |  |  |  |  |  |  |  |  |
Youku Tudou | Trade names, trademarks and domain names |  |  |  |  |  |  |  |  |  |  |
The allocation of the purchase price at the date of acquisition |  |  |  |  |  |  |  |  |  |  |
Amortizable intangible assets |  |  |  |  |  |  |  |  |  |  | 4,047
Youku Tudou | User base and customer relationships |  |  |  |  |  |  |  |  |  |  |
The allocation of the purchase price at the date of acquisition |  |  |  |  |  |  |  |  |  |  |
Amortizable intangible assets |  |  |  |  |  |  |  |  |  |  | 284
Youku Tudou | Developed technology and patents |  |  |  |  |  |  |  |  |  |  |
The allocation of the purchase price at the date of acquisition |  |  |  |  |  |  |  |  |  |  |
Amortizable intangible assets |  |  |  |  |  |  |  |  |  |  | 143
Youku Tudou | Others |  |  |  |  |  |  |  |  |  |  |
The allocation of the purchase price at the date of acquisition |  |  |  |  |  |  |  |  |  |  |
Amortizable intangible assets |  |  |  |  |  |  |  |  |  |  | 262
Youku Tudou | Licensed copyrights of video content |  |  |  |  |  |  |  |  |  |  |
The allocation of the purchase price at the date of acquisition |  |  |  |  |  |  |  |  |  |  |
Amortizable intangible assets |  |  |  |  |  |  |  |  |  |  | ¥ 703
Ordinary Shares | Youku Tudou |  |  |  |  |  |  |  |  |  |  |
Acquisition |  |  |  |  |  |  |  |  |  |  |
Equity interest (as a percent) |  |  |  | 16.50% | 16.50% |  |  |  |  |  |
Purchase consideration, equity method |  |  |  | $ 1,090 | ¥ 6,723 |  |  |  |  |  |

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