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Income tax expenses- General (Details)
¥ in Millions, $ in Millions
12 Months Ended
Mar. 31, 2018
USD ($)
Mar. 31, 2018
CNY (¥)
Mar. 31, 2017
CNY (¥)
Mar. 31, 2016
CNY (¥)
Mar. 31, 2015
Mar. 31, 2014
Mar. 31, 2012
Composition of income tax expenses              
Current income tax expense   ¥ 17,223 ¥ 13,495 ¥ 7,223      
Deferred taxation $ 156 976 281 1,226      
Income tax expenses $ 2,901 ¥ 18,199 ¥ 13,776 ¥ 8,449      
Enterprise income tax rate (as a percent) 25.00% 25.00% 25.00% 25.00%      
Total tax adjustments   ¥ 2,295 ¥ 720 ¥ 0      
Undistributed earnings intended to be invested indefinitely in the PRC   ¥ 28,600 ¥ 28,200        
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%          
Alibaba China | PRC | High and New Technology Enterprises              
Composition of income tax expenses              
Enterprise income tax rate (as a percent)     15.00% 15.00% 15.00%    
Alibaba China | PRC | Key Software Enterprise              
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              
Enterprise income tax rate (as a percent)     15.00% 15.00% 15.00%    
Taobao China | PRC | Key Software Enterprise              
Composition of income tax expenses              
Preferential tax rate (as a percent)       10.00% 10.00%    
Tmall China | PRC | High and New Technology Enterprises              
Composition of income tax expenses              
Enterprise income tax rate (as a percent)     15.00%        
Preferential tax rate (as a percent)       12.50% 12.50% 12.50%  
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
Tmall China | PRC | Key Software Enterprise              
Composition of income tax expenses              
Enterprise income tax rate (as a percent)       12.50%      
Preferential tax rate (as a percent)       10.00%