ACQUISITIONS (Details)	3 Months Ended	12 Months Ended
Jun. 29, 2019 item	Dec. 28, 2019 agreement item
ACQUISITIONS
Number of asset purchase agreements \| agreement		3
Number of asset acquired operating businesses \| item	4	4

Represents the number of asset purchase agreements for completed by company

No definition available.

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