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Investment in equity investees- Others (Details) - CNY (¥)
12 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Mar. 31, 2015
Investment in equity investees      
Carrying value as equity method investment ¥ 84,964,000,000 ¥ 58,197,000,000 ¥ 18,204,000,000
Impairment charge of equity method investments 245,000,000 0 ¥ 438,000,000
Equity method investments, publicly traded      
Investment in equity investees      
Carrying value as equity method investment 67,767,000,000    
Market values of equity method investments 67,793,000,000    
Alibaba Pictures      
Investment in equity investees      
Carrying value as equity method investment 30,102,000,000    
Not other-than-temporary decline in market value against carrying amount of equity method investment 14,487,000,000    
Individually immaterial cost method investments, fair value estimated | Carrying amount      
Investment in equity investees      
Cost method investment 17,273,000,000 9,223,000,000  
Individually immaterial cost method investments, fair value estimated | Approximate fair value      
Investment in equity investees      
Cost method investment 46,351,000,000 25,639,000,000  
Individually immaterial cost method investments, not practical to estimate fair value | Carrying amounts      
Investment in equity investees      
Cost method investments carrying value for which there is no fair value estimate ¥ 18,131,000,000 ¥ 24,041,000,000