FINANCIAL INFORMATION OF PARENT COMPANY (Narrative) (Details)	12 Months Ended
Dec. 31, 2025
FINANCIAL INFORMATION OF PARENT COMPANY [Line Items]
Foreign currency exchange rate weighted average translation rate	6.9931
Parent Company
FINANCIAL INFORMATION OF PARENT COMPANY [Line Items]
Foreign currency exchange rate weighted average translation rate	6.9931

Weighted Average Foreign exchange rate used to translate amounts denominated in functional currency to reporting currency.

No definition available.

Name:	bzun_ForeignCurrencyExchangeRateWeightedAverageTranslationRate
Namespace Prefix:	bzun_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	duration