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Income tax expenses- General (Details)
¥ in Millions, $ in Millions
12 Months Ended
Mar. 31, 2017
Mar. 31, 2016
USD ($)
Mar. 31, 2016
CNY (¥)
Mar. 31, 2015
CNY (¥)
Mar. 31, 2014
CNY (¥)
Mar. 31, 2013
Mar. 31, 2012
Composition of income tax expenses              
Current income tax expense     ¥ 7,223 ¥ 4,757 ¥ 1,730    
Deferred taxation   $ 190 1,226 1,659 1,466    
Income tax expenses   $ 1,310 ¥ 8,449 ¥ 6,416 ¥ 3,196    
Enterprise income tax rate (as a percent)   25.00% 25.00% 25.00% 25.00%    
Undistributed earnings intended to be invested indefinitely in the PRC     ¥ 13,600        
Cayman Islands              
Composition of income tax expenses              
Withholding tax to be imposed upon payments of dividends to shareholders (as a percent)   0.00% 0.00%        
Hong Kong              
Composition of income tax expenses              
Enterprise income tax rate (as a percent)   16.50% 16.50% 16.50% 16.50%    
PRC              
Composition of income tax expenses              
Enterprise income tax rate (as a percent)   25.00% 25.00% 25.00% 25.00%    
Withholding income tax rate on dividends declared by PRC companies to their foreign investors (as a percent)   10.00% 10.00% 10.00% 10.00%    
Lower withholding income tax rate on dividends declared by PRC companies to foreign investors with certain criteria met (as a percent)   5.00% 5.00% 5.00% 5.00%    
Minimum percentage of ownership interests held by investors in Hong Kong to qualify for lower withholding tax rate (as a percent)   25.00% 25.00% 25.00% 25.00%    
PRC | High and New Technology Enterprises              
Composition of income tax expenses              
Preferential tax rate (as a percent)   15.00% 15.00%        
PRC | Software Enterprise              
Composition of income tax expenses              
Period of full exemption from income tax   2 years 2 years        
Reduction in preferential tax rate during subsequent three years (as a percent)   50.00% 50.00%        
Period of 50% reduction to income tax rate   3 years 3 years        
PRC | Key Software Enterprise              
Composition of income tax expenses              
Preferential tax rate (as a percent)   10.00% 10.00%        
Period of Enterprise status subject to review   2 years 2 years        
Alibaba China | PRC              
Composition of income tax expenses              
Preferential tax rate (as a percent)         10.00% 10.00%  
Alibaba China | PRC | High and New Technology Enterprises              
Composition of income tax expenses              
Preferential tax rate (as a percent)   15.00% 15.00% 15.00%      
Taobao China | PRC              
Composition of income tax expenses              
Preferential tax rate (as a percent)         10.00% 10.00%  
Taobao China | PRC | High and New Technology Enterprises              
Composition of income tax expenses              
Preferential tax rate (as a percent)   15.00% 15.00% 15.00%      
Tmall China | PRC | High and New Technology Enterprises              
Composition of income tax expenses              
Preferential tax rate (as a percent)   12.50% 12.50% 12.50% 12.50%    
Tmall China | PRC | High and New Technology Enterprises | Future              
Composition of income tax expenses              
Preferential tax rate (as a percent) 15.00%            
Tmall China | PRC | Software Enterprise              
Composition of income tax expenses              
Period of full exemption from income tax             2 years
Reduction in preferential tax rate during subsequent three years (as a percent)             50.00%
Period of 50% reduction to income tax rate             3 years