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Income tax (Narrative) (Details) ¥ in Thousands | Dec. 31, 2016 CNY (¥) item
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Income Tax [Line Items] |
Operating loss carryforwards | ¥ | ¥ 24,461
Number of subsidiaries provided no valuation allowance | item | 2

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- References No definition available. + Details
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Namespace Prefix: | bzun_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Represents the number of subsidiaries provided valuation allowance. + References No definition available. + Details
Name: | bzun_NumberOfSubsidiariesProvidedValuationAllowance
Namespace Prefix: | bzun_
Data Type: | xbrli:integerItemType
Balance Type: | na
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- Definition Amount of operating loss carryforward, before tax effects, available to reduce future taxable income under enacted tax laws. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32559-109319 + Details
Name: | us-gaap_OperatingLossCarryforwards
Namespace Prefix: | us-gaap_
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Balance Type: | debit
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