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Accounts receivable, net (Details)
¥ in Thousands, $ in Thousands
12 Months Ended
Dec. 31, 2018
USD ($)
Dec. 31, 2018
CNY (¥)
Dec. 31, 2017
CNY (¥)
Dec. 31, 2016
CNY (¥)
Dec. 31, 2018
CNY (¥)
Jan. 02, 2018
CNY (¥)
Accounts receivable, net            
Subtotal     ¥ 4,928,418   ¥ 5,792,275  
Less: allowance for doubtful accounts     (124,891)   (117,544)  
Total $ 825,355   4,803,527   5,674,731 ¥ 5,334,521
Allowance for doubtful accounts:            
Provision for allowance during the year $ (25,512) ¥ (175,405) (130,862) ¥ (57,743)    
Accounts receivable, net            
Allowance for doubtful accounts:            
Balance at beginning of the year   (124,891) (46,209)      
Provision for allowance during the year   (166,396) (111,183) (53,316)    
Write-offs during the year   173,743 32,501 7,107    
Balance at end of the year   ¥ (117,544) (124,891) ¥ (46,209)    
Other trade receivables            
Accounts receivable, net            
Subtotal     4,611,930   5,302,391  
Collateralized accounts receivables     1,000,000   1,200,000  
Delivery service providers            
Accounts receivable, net            
Subtotal     298,124   458,488  
Others            
Accounts receivable, net            
Subtotal     ¥ 18,364   ¥ 31,396