Financial Information For The Company And Its Subsidiaries (Narrative) (Details)	3 Months Ended
Apr. 30, 2016
Financial Information For The Company And Its Subsidiaries [Abstract]
Guarantors, ownership percentage by parent	100.00%

Financial Information For The Company And Its Subsidiaries [Abstract]

No definition available.

Name:	cal_FinancialInformationForCompanyAndItsSubsidiariesAbstract
Namespace Prefix:	cal_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration