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Summary of significant accounting policies- Various (Details)
$ in Millions
12 Months Ended
Mar. 31, 2016
CNY (¥)
segment
Mar. 31, 2015
CNY (¥)
segment
Mar. 31, 2014
CNY (¥)
segment
Mar. 31, 2016
USD ($)
Mar. 31, 2016
CNY (¥)
Mar. 31, 2015
USD ($)
Mar. 31, 2015
CNY (¥)
Mar. 31, 2013
CNY (¥)
Segment reporting                
Number of operating segment | segment 1 1 1          
Number of reportable segment | segment 1 1 1          
Sales and marketing expenses                
Advertising and promotional expenses ¥ 5,524,000,000 ¥ 4,090,000,000 ¥ 2,022,000,000          
Leases                
Capital Lease Obligations     0   ¥ 0   ¥ 0  
Cash and cash equivalents                
Amount of cash and cash equivalents     33,045,000,000 $ 16,566 106,818,000,000 $ 16,779 108,193,000,000 ¥ 30,396,000,000
Short term investments                
Short-term investments- fixed deposits         97,000,000   11,462,000,000  
Short-term investments       $ 729 4,700,000,000   14,148,000,000  
Investment in equity investees                
Period of time within which results of equity method earnings are recognized in arrears 3 months              
Minimum                
Loan and VAT receivables                
Collection periods extended for VAT receivables 3 months              
Investment securities                
Maturities of held-to-maturity securities held 1 year              
Maximum                
Loan and VAT receivables                
Collection periods extended for VAT receivables 6 months              
Investment securities                
Maturities of held-to-maturity securities held 10 years              
Micro loans receivables | Minimum                
Loan and VAT receivables                
Credit periods extended 7 days              
Micro loans receivables | Maximum                
Loan and VAT receivables                
Credit periods extended 360 days              
VAT receivables                
Loan and VAT receivables                
Allowance for doubtful accounts relating to VAT receivables         699,000,000   184,000,000  
Cash held in accounts managed by Alipay                
Cash and cash equivalents                
Amount of cash and cash equivalents         786,000,000   1,443,000,000  
Short term investments held in accounts managed by Alipay                
Short term investments                
Short-term investments         ¥ 2,564,000,000   ¥ 1,185,000,000  
Government-mandated multi-employer defined contribution plan in PRC                
Other employee benefits                
Contribution amount charged to the consolidated income statements ¥ 2,094,000,000 ¥ 1,601,000,000 ¥ 974,000,000