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REVENUES (Details) - Loyalty Program - USD ($) $ in Millions	12 Months Ended
	Jan. 30, 2021	Feb. 01, 2020
Revenues
Contract with Customer, Liability, Increase Due to Points and Material Rights Accrued for Purchases	$ 26.4	$ 27.8
Contract with Customer, Liability, Decrease Due to Expirations and Redemptions	$ 28.8	$ 26.0

X

- Definition

Amount of decrease in obligation to transfer goods or services to customers for which consideration from the customer has been received or is due, from expirations and redemptions.

+ References

No definition available.

+ Details

Name:	cal_ContractWithCustomerLiabilityDecreaseDueToExpirationsAndRedemptions
Namespace Prefix:	cal_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

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.

+ References

No definition available.

+ Details

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

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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

X

- Details

Name:	srt_ProductOrServiceAxis=cal_LoyaltyProgramMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: