Acquisition - Schedule of allocation of purchase price (Parenthetical) (Details) ¥ in Millions	Apr. 01, 2019 CNY (¥)
Tianbo
Business Acquisition [Line Items]
Cash and cash equivalents acquired	¥ 175.5

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

No definition available.

Name:	us-gaap_BusinessAcquisitionLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration