v3.20.1

ACQUISITIONS (Details)	12 Months Ended
	Dec. 28, 2019 agreement item
ACQUISITIONS
Number of asset purchase agreements | agreement	3
Number of asset acquired operating businesses | item	4

X

- Definition

Represents the number of asset purchase agreements for completed by company

+ References

No definition available.

+ Details

Name:	cuo_NumberOfAssetPurchaseAgreements
Namespace Prefix:	cuo_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The number of assets of operating business acquired

+ References

No definition available.

+ Details

Name:	cuo_NumberOfAssetsOfOperatingBusinessAcquired
Namespace Prefix:	cuo_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

X

- References

No definition available.

+ Details

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