v3.20.1

ACQUISITIONS (Details) | 12 Months Ended
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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