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Derivative Financial Instruments (Details) (USD $)
In Thousands, unless otherwise specified
 6 Months Ended
Nov. 29, 2014
bu
May 31, 2014
Derivatives, Fair Value [Line Items]    
Derivative, fair value $ 393us-gaap_DerivativeFairValueOfDerivativeNet $ 1,255us-gaap_DerivativeFairValueOfDerivativeNet
Corn Commodity [Member]    
Derivatives, Fair Value [Line Items]    
Derivative, fair value 186us-gaap_DerivativeFairValueOfDerivativeNet
/ us-gaap_DerivativeInstrumentRiskAxis
= calm_CornCommodityMember		  
Underlying, derivative volume 2,600,000calm_UnderlyingDerivativeVolume1
/ us-gaap_DerivativeInstrumentRiskAxis
= calm_CornCommodityMember		  
Soybean Meal Commodity [Member]    
Derivatives, Fair Value [Line Items]    
Derivative, fair value $ 207us-gaap_DerivativeFairValueOfDerivativeNet
/ us-gaap_DerivativeInstrumentRiskAxis
= calm_SoybeanMealCommodityMember		  
Underlying, derivative mass 27,100calm_UnderlyingDerivativeMass1
/ us-gaap_DerivativeInstrumentRiskAxis
= calm_SoybeanMealCommodityMember		  
Maximum [Member]    
Derivatives, Fair Value [Line Items]    
Term of contract 6 months