Revenues (Details) - Loyalty Program - USD ($) $ in Millions	3 Months Ended
May 01, 2021	May 02, 2020
Revenues
Contract with customer, liability, increase due to points and material rights accrued for purchases	$ 9.3	$ 5.9
Contract with customer, liability, decrease due to expirations and redemptions	$ 7.1	$ 5.0

Amount of increase in obligation to transfer goods or services to customers for which consideration from the customer has been received or is due, from points and material rights accrued for purchases.

No definition available.

Name:	cal_ContractWithCustomerLiabilityIncreaseDueToPointsAndMaterialRightsAccruedForPurchases
Namespace Prefix:	cal_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration