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Share-based payments - Share-based compensation expenses (Details) - CNY (¥)
¥ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Share-based compensation expenses      
Share-based compensation expenses ¥ (671,210) ¥ (667,098) ¥ (475,653)
Fulfillment expenses      
Share-based compensation expenses      
Share-based compensation expenses (73,151) (73,235) (38,428)
Marketing expenses      
Share-based compensation expenses      
Share-based compensation expenses (41,063) (40,364) (38,459)
Technology and content expenses      
Share-based compensation expenses      
Share-based compensation expenses (203,594) (206,073) (183,122)
General and administrative expenses      
Share-based compensation expenses      
Share-based compensation expenses ¥ (353,402) ¥ (347,426) ¥ (215,644)