REVENUES (Details) - Loyalty Program - USD ($) $ in Millions	9 Months Ended
Oct. 31, 2020	Nov. 02, 2019
Revenues
Contract with Customer, Liability, Increase Due to Points and Material Rights Accrued for Purchases	$ 20.7	$ 24.2
Contract with Customer, Liability, Decrease Due to Expirations and Redemptions	$ 22.5	$ 21.6

Amount of increase in obligation to transfer good or service to customer for which consideration from 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