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Investment in equity investees- Others (Details) - CNY (¥)
12 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Mar. 31, 2014
Investment in equity investees      
Carrying value as equity method investment ¥ 58,197,000,000 ¥ 18,204,000,000 ¥ 4,077,000,000
Impairment charge of equity method investments 0 438,000,000 ¥ 0
Equity method investments, publicly traded      
Investment in equity investees      
Carrying value as equity method investment 42,395,000,000    
Open market values of equity method investments 38,344,000,000    
Impairment charge of equity method investments 0    
Individually immaterial cost method investments, fair value estimated | Carrying amount      
Investment in equity investees      
Cost method investment 9,223,000,000 6,046,000,000  
Individually immaterial cost method investments, fair value estimated | Approximate fair value      
Investment in equity investees      
Cost method investment 25,639,000,000 14,965,000,000  
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 ¥ 24,041,000,000 ¥ 9,627,000,000