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Financial Statement Impact Of Fires (Narrative) (Details) (USD $)
3 Months Ended
Mar. 01, 2014
Aug. 30, 2014
Nov. 30, 2013
property
Property, Plant and Equipment [Line Items]      
Insurance claims receivable $ 2,000,000us-gaap_InsuranceSettlementsReceivable    
Deductibles and coinsurance 720,000calm_BusinessInterruptionInsuranceRecoveryDeductibleAndCoinsurance    
Cost Of Sales [Member]      
Property, Plant and Equipment [Line Items]      
Business interruption gains   60,000us-gaap_GainOnBusinessInterruptionInsuranceRecovery
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_CostOfSalesMember
 
Other Income (Expense) [Member]      
Property, Plant and Equipment [Line Items]      
Gain on property damage insurance claim   886,000calm_GainLossPropertyDamageInsuranceClaim
/ us-gaap_IncomeStatementLocationAxis
= calm_OtherIncomeExpenseMember
 
Florida [Member]      
Property, Plant and Equipment [Line Items]      
Number of pullet houses destroyed     2calm_NumberOfPulletHousesDestroyed
/ us-gaap_BusinessInterruptionLossAxis
= calm_FloridaMember
Shady Dale Georgia [Member]      
Property, Plant and Equipment [Line Items]      
Number of pullet houses destroyed 2calm_NumberOfPulletHousesDestroyed
/ us-gaap_BusinessInterruptionLossAxis
= calm_ShadyDaleGeorgiaMember
   
Reimbursement of inventory written off   $ 1,000,000calm_InventoryWriteDownReimbursement
/ us-gaap_BusinessInterruptionLossAxis
= calm_ShadyDaleGeorgiaMember