Represents the percentage of ownership of common stock or equity participation owned by the related party in the entity.

No definition available.

Name:	gcfb_RelatedPartyOwnershipPercentage
Namespace Prefix:	gcfb_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

Summary of significant accounting policies (Details 2)	3 Months Ended
Summary of significant accounting policies (Details 2)	Apr. 02, 2013	Mar. 27, 2012	Apr. 02, 2013 Minimum	Apr. 02, 2013 Maximum	May 13, 2013 CDP Common Stock
Related parties
Percentage of ownership interest of related party in the entity's common stock					78.60%
Fiscal year
Duration of fiscal year	371 days	364 days	364 days	371 days