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Fair Value Measurements (Details) (USD $)
 6 Months Ended 12 Months Ended
May 30, 2015
Nov. 29, 2014
Dec. 29, 2010
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Restricted trust, included in Other noncurrent assets $ 816,000us-gaap_TradingSecurities $ 893,000us-gaap_TradingSecurities  
Change in fair value of TransWeb contingent earn-out 0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInEarnings 0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInEarnings  
Estimate of Fair Value Measurement [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Long-term debt, fair value 414,235,000us-gaap_LongTermDebtFairValue
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember		 408,208,000us-gaap_LongTermDebtFairValue
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember		  
Reported Value Measurement [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Long-term debt, fair value 418,027,000us-gaap_LongTermDebtFairValue
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember		 411,563,000us-gaap_LongTermDebtFairValue
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember		  
Mutual fund investments - equities [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Restricted trust, included in Other noncurrent assets 404,000us-gaap_TradingSecurities
/ us-gaap_FairValueByAssetClassAxis
= clc_MutualFundInvestmentsEquitiesMember		 437,000us-gaap_TradingSecurities
/ us-gaap_FairValueByAssetClassAxis
= clc_MutualFundInvestmentsEquitiesMember		  
Mutual fund investments - bonds [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Restricted trust, included in Other noncurrent assets 398,000us-gaap_TradingSecurities
/ us-gaap_FairValueByAssetClassAxis
= clc_MutualFundInvestmentsBondsMember		 442,000us-gaap_TradingSecurities
/ us-gaap_FairValueByAssetClassAxis
= clc_MutualFundInvestmentsBondsMember		  
Cash and Cash Equivalents [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Restricted trust, included in Other noncurrent assets 14,000us-gaap_TradingSecurities
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_CashAndCashEquivalentsMember		 14,000us-gaap_TradingSecurities
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_CashAndCashEquivalentsMember		  
Level 1 [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Restricted trust, included in Other noncurrent assets 816,000us-gaap_TradingSecurities
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member		 893,000us-gaap_TradingSecurities
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member		  
Level 1 [Member] | Mutual fund investments - equities [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Restricted trust, included in Other noncurrent assets 404,000us-gaap_TradingSecurities
/ us-gaap_FairValueByAssetClassAxis
= clc_MutualFundInvestmentsEquitiesMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member		 437,000us-gaap_TradingSecurities
/ us-gaap_FairValueByAssetClassAxis
= clc_MutualFundInvestmentsEquitiesMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member		  
Level 1 [Member] | Mutual fund investments - bonds [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Restricted trust, included in Other noncurrent assets 398,000us-gaap_TradingSecurities
/ us-gaap_FairValueByAssetClassAxis
= clc_MutualFundInvestmentsBondsMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member		 442,000us-gaap_TradingSecurities
/ us-gaap_FairValueByAssetClassAxis
= clc_MutualFundInvestmentsBondsMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member		  
Level 1 [Member] | Cash and Cash Equivalents [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Restricted trust, included in Other noncurrent assets 14,000us-gaap_TradingSecurities
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_CashAndCashEquivalentsMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member		 14,000us-gaap_TradingSecurities
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_CashAndCashEquivalentsMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member		  
Level 2 [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Restricted trust, included in Other noncurrent assets 0us-gaap_TradingSecurities
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member		 0us-gaap_TradingSecurities
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member		  
Level 2 [Member] | Mutual fund investments - equities [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Restricted trust, included in Other noncurrent assets 0us-gaap_TradingSecurities
/ us-gaap_FairValueByAssetClassAxis
= clc_MutualFundInvestmentsEquitiesMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member		 0us-gaap_TradingSecurities
/ us-gaap_FairValueByAssetClassAxis
= clc_MutualFundInvestmentsEquitiesMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member		  
Level 2 [Member] | Mutual fund investments - bonds [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Restricted trust, included in Other noncurrent assets 0us-gaap_TradingSecurities
/ us-gaap_FairValueByAssetClassAxis
= clc_MutualFundInvestmentsBondsMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member		 0us-gaap_TradingSecurities
/ us-gaap_FairValueByAssetClassAxis
= clc_MutualFundInvestmentsBondsMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member		  
Level 2 [Member] | Cash and Cash Equivalents [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Restricted trust, included in Other noncurrent assets 0us-gaap_TradingSecurities
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_CashAndCashEquivalentsMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member		 0us-gaap_TradingSecurities
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_CashAndCashEquivalentsMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member		  
Level 3 [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Restricted trust, included in Other noncurrent assets 0us-gaap_TradingSecurities
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member		 0us-gaap_TradingSecurities
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member		  
Level 3 [Member] | Mutual fund investments - equities [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Restricted trust, included in Other noncurrent assets 0us-gaap_TradingSecurities
/ us-gaap_FairValueByAssetClassAxis
= clc_MutualFundInvestmentsEquitiesMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member		 0us-gaap_TradingSecurities
/ us-gaap_FairValueByAssetClassAxis
= clc_MutualFundInvestmentsEquitiesMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member		  
Level 3 [Member] | Mutual fund investments - bonds [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Restricted trust, included in Other noncurrent assets 0us-gaap_TradingSecurities
/ us-gaap_FairValueByAssetClassAxis
= clc_MutualFundInvestmentsBondsMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member		 0us-gaap_TradingSecurities
/ us-gaap_FairValueByAssetClassAxis
= clc_MutualFundInvestmentsBondsMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member		  
Level 3 [Member] | Cash and Cash Equivalents [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Restricted trust, included in Other noncurrent assets 0us-gaap_TradingSecurities
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_CashAndCashEquivalentsMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member		 0us-gaap_TradingSecurities
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_CashAndCashEquivalentsMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member		  
TransWeb [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Other long-term liability     1,018,000us-gaap_OtherLiabilitiesFairValueDisclosure
/ us-gaap_BusinessAcquisitionAxis
= clc_TranswebMember
Foreign Exchange Contract [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Fair value of contract   362,000us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForeignExchangeContractMember		  
Foreign Exchange Contract [Member] | Level 1 [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Fair value of contract   0us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForeignExchangeContractMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member		  
Foreign Exchange Contract [Member] | Level 2 [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Fair value of contract   362,000us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForeignExchangeContractMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member		  
Foreign Exchange Contract [Member] | Level 3 [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Fair value of contract   0us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForeignExchangeContractMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member		  
Other Noncurrent Liabilities [Member] | Filter Resources, Inc. [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Filter Resources contingent earn-out, included in Other long-term liabilities 1,282,000us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisObligations
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherNoncurrentLiabilitiesMember
/ us-gaap_BusinessAcquisitionAxis
= clc_FilterResourcesInc.Member		    
Other Noncurrent Liabilities [Member] | Filter Resources, Inc. [Member] | Level 1 [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Filter Resources contingent earn-out, included in Other long-term liabilities 0us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisObligations
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherNoncurrentLiabilitiesMember
/ us-gaap_BusinessAcquisitionAxis
= clc_FilterResourcesInc.Member
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member		    
Other Noncurrent Liabilities [Member] | Filter Resources, Inc. [Member] | Level 2 [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Filter Resources contingent earn-out, included in Other long-term liabilities 0us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisObligations
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherNoncurrentLiabilitiesMember
/ us-gaap_BusinessAcquisitionAxis
= clc_FilterResourcesInc.Member
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member		    
Other Noncurrent Liabilities [Member] | Filter Resources, Inc. [Member] | Level 3 [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Filter Resources contingent earn-out, included in Other long-term liabilities 1,282,000us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisObligations
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherNoncurrentLiabilitiesMember
/ us-gaap_BusinessAcquisitionAxis
= clc_FilterResourcesInc.Member
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member		    
Accrued Liabilities [Member] | Foreign Exchange Contract [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Fair value of contract 398,000us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_AccruedLiabilitiesMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForeignExchangeContractMember		 367,000us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_AccruedLiabilitiesMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForeignExchangeContractMember		  
Accrued Liabilities [Member] | Foreign Exchange Contract [Member] | Level 1 [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Fair value of contract 0us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_AccruedLiabilitiesMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForeignExchangeContractMember
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= us-gaap_FairValueInputsLevel1Member		 0us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures
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= us-gaap_AccruedLiabilitiesMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForeignExchangeContractMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member		  
Accrued Liabilities [Member] | Foreign Exchange Contract [Member] | Level 2 [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Fair value of contract 398,000us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_AccruedLiabilitiesMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForeignExchangeContractMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member		 367,000us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_AccruedLiabilitiesMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForeignExchangeContractMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member		  
Accrued Liabilities [Member] | Foreign Exchange Contract [Member] | Level 3 [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Fair value of contract $ 0us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_AccruedLiabilitiesMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForeignExchangeContractMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member		 $ 0us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_AccruedLiabilitiesMember
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