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Significant restructuring transaction, mergers and acquisitions and equity investments- Damai (Details)
¥ in Millions, $ in Millions
1 Months Ended 12 Months Ended
Mar. 31, 2017
USD ($)
Mar. 31, 2017
CNY (¥)
Mar. 31, 2018
CNY (¥)
Mar. 31, 2017
CNY (¥)
Mar. 31, 2016
CNY (¥)
Mar. 31, 2018
USD ($)
Mar. 31, 2018
CNY (¥)
Feb. 28, 2017
The allocation of the purchase price at the date of acquisition                
Goodwill   ¥ 125,420   ¥ 125,420 ¥ 81,645 $ 25,850 ¥ 162,149  
Total purchase price is comprised of:                
- cash consideration     ¥ 17,300 41,836 ¥ 3,055      
Trade names, trademarks and domain names | Maximum                
Total purchase price is comprised of:                
Estimated amortization periods     20 years          
Non-compete agreements | Maximum                
Total purchase price is comprised of:                
Estimated amortization periods     6 years          
Developed technology and patents | Maximum                
Total purchase price is comprised of:                
Estimated amortization periods     5 years          
Damai                
Acquisition                
Equity interest (as a percent)               32.00%
The allocation of the purchase price at the date of acquisition                
Net assets acquired   100   100        
Goodwill   2,693   2,693        
Deferred tax assets   16   16        
Deferred tax liabilities   (202)   (202)        
Total   3,829   3,829        
Total purchase price is comprised of:                
- cash consideration $ 393 2,711            
- fair value of previously held equity interests   1,118            
Total   ¥ 3,829            
Weighted average amortization period 7 years 4 months 24 days 7 years 4 months 24 days            
Gain recognized in relation to the revaluation of previously held equity interest relating to the step acquisition       201        
Damai | Maximum                
Total purchase price is comprised of:                
Estimated amortization periods 10 years 10 years            
Damai | Trade names, trademarks and domain names                
The allocation of the purchase price at the date of acquisition                
Amortizable intangible assets   ¥ 684   684        
Damai | Non-compete agreements                
The allocation of the purchase price at the date of acquisition                
Amortizable intangible assets   271   271        
Damai | Developed technology and patents                
The allocation of the purchase price at the date of acquisition                
Amortizable intangible assets   ¥ 267   ¥ 267