Name:	cal_BusinessAcquisitionsPurchaseObligation
Namespace Prefix:	cal_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

The period of time after which the noncontrolling interest is subject to the mandatory purchase obligation.

No definition available.

Name:	cal_BusinessAcquisitionsPurchaseObligationInitialTerm
Namespace Prefix:	cal_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

The amount of fair value adjustments to mandatory purchase obligations.

No definition available.

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

The amount of fair value adjustments of mandatory purchase obligation after tax basis

No definition available.

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

The amount of fair value adjustments of mandatory purchase obligation, per diluted share.

No definition available.

Name:	cal_FairValueAdjustmentsOfMandatoryPurchaseObligationPerDilutedShare
Namespace Prefix:	cal_
Data Type:	dtr-types:perShareItemType
Balance Type:	na
Period Type:	duration

Number of retail stores closed during the year.

No definition available.

Name:	cal_NumberOfRetailStoresClosed
Namespace Prefix:	cal_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

The cash outflow for mandatory purchase obligation.

No definition available.

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

Discloses the amount charged against the accrued restructuring reserves, or earnings if not previously accrued, during the period for the specified type of restructuring cost, after tax.

No definition available.

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

Discloses the amount charged against the accrued restructuring reserves, or earnings if not previously accrued, during the period for the specified type of restructuring cost per diluted share.

No definition available.

Name:	cal_RestructuringAndRelatedCostIncurredCostPerDilutedShare
Namespace Prefix:	cal_
Data Type:	dtr-types:perShareItemType
Balance Type:	na
Period Type:	duration

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.

No definition available.

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

Amount, after cash payment, of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI https://asc.fasb.org/extlink&oid=126954810&loc=d3e3602-108585

Name:	us-gaap_RestructuringCosts
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Carrying amount (including both current and noncurrent portions of the accrual) as of the balance sheet date pertaining to a specified type of cost associated with exit from or disposal of business activities or restructuring pursuant to a duly authorized plan.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 420
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (b)(2)
-URI https://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 420
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SAB TOPIC 5.P.4(b)(2))
-URI https://asc.fasb.org/extlink&oid=115931487&loc=d3e140904-122747

Name:	us-gaap_RestructuringReserve
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Name:	us-gaap_BusinessAcquisitionAxis=cal_BlowfishLLCMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Name:	us-gaap_IncomeStatementLocationAxis=cal_RestructuringAndOtherSpecialChargesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Name:	us-gaap_RestructuringCostAndReserveAxis=cal_RestructuringAndOtherSpecialChargesMember
Namespace Prefix:
Data Type:	na
Balance Type:
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Name:	us-gaap_StatementBusinessSegmentsAxis=cal_BrandPortfolioMember
Namespace Prefix:
Data Type:	na
Balance Type:
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