XML 120 R90.htm IDEA: XBRL DOCUMENT v3.21.1

Lease (Details) - CNY (¥) ¥ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Lease (Details) [Line Items]
Lease termination losses	¥ 168,722
Minimum [Member]
Lease (Details) [Line Items]
Real estate leases	2 years
Maximum [Member]
Lease (Details) [Line Items]
Real estate leases	20 years

X

- References

No definition available.

+ Details

Name:	uk_LeaseDetailsLineItems
Namespace Prefix:	uk_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Real estate leases term.

+ References

No definition available.

+ Details

Name:	uk_RealEstateLeasesTerm
Namespace Prefix:	uk_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Amount of gain (loss) on termination of lease before expiration of lease term.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 40
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=121604053&loc=SL77918607-209975

+ Details

Name:	us-gaap_GainLossOnTerminationOfLease
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Details

Name:	srt_RangeAxis=srt_MinimumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_RangeAxis=srt_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: