Merchandise Inventories and Sources of Supply (Details) - USD ($) $ in Thousands	Apr. 30, 2016	Jan. 30, 2016
Merchandise Inventories and Sources of Supply
Merchandise - in store/e-commerce	$ 44,538	$ 31,751
Merchandise - in transit	5,993	10,730
Total merchandise inventories	$ 50,531	$ 42,481

Carrying amount as of the balance sheet date of merchandise inventory purchased by a retailer, wholesaler or distributor to which the entity holds the title but not the physical possession because the merchandise is currently being transported.

No definition available.

+ Details

Name:	cbk_RetailRelatedInventoryMerchandiseInTransit
Namespace Prefix:	cbk_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- References

No definition available.

+ Details

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

- Definition

Carrying amount as of the balance sheet date of merchandise inventory held by a retailer, wholesaler, or distributor for future sale; includes packaging and other supplies used to store, transport, or present merchandise inventory.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.6(a))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

Name:	us-gaap_RetailRelatedInventory
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Carrying amount as of the balance sheet date of merchandise inventory purchased by a retailer, wholesaler or distributor and held for future sale.

+ References

+ Details

Name:	us-gaap_RetailRelatedInventoryMerchandise
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant