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Discontinued operations - Additional information (Details) ¥ in Millions	1 Months Ended
	Jun. 30, 2018 CNY (¥)
Discontinued operations
Disposal of the discontinued business resulting a gain of disposal	¥ 0.8

X

- Definition

Amount before tax of gain (loss) recognized on the sale or disposal of a disposal group. Includes discontinued operations.

+ References

No definition available.

+ Details

Name:	tc_DisposalGroupDiscontinuedOperationGainLossOnDisposal
Namespace Prefix:	tc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

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- References

No definition available.

+ Details

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