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Intangible assets, net - General (Details)
¥ in Millions, $ in Millions
1 Months Ended 12 Months Ended
Apr. 30, 2017
CNY (¥)
Mar. 31, 2018
USD ($)
Mar. 31, 2018
CNY (¥)
Mar. 31, 2017
CNY (¥)
Mar. 31, 2016
CNY (¥)
Mar. 31, 2018
CNY (¥)
Intangible assets            
Gross carrying amount       ¥ 29,096   ¥ 50,398
Less: accumulated amortization and impairment       (14,988)   (22,933)
Net book value   $ 4,378   14,108   27,465
Amortization expenses   $ 2,109 ¥ 13,231 9,008 ¥ 3,278  
Trade names, trademarks and domain names            
Intangible assets            
Gross carrying amount       8,100   14,198
User base and customer relationships            
Intangible assets            
Gross carrying amount       4,169   13,510
Licensed copyrights            
Intangible assets            
Gross carrying amount       6,087   9,182
Non-compete agreements            
Intangible assets            
Gross carrying amount       5,915   7,820
Non-compete agreements | Youku            
Intangible assets            
Intangible assets acquired ¥ 2,528          
Remaining amortization period   2 years 2 years      
Developed technology and patents            
Intangible assets            
Gross carrying amount       4,793   5,463
Others            
Intangible assets            
Gross carrying amount       ¥ 32   ¥ 225