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Business Acquisitions, Investments and Redeemable Noncontrolling Interests (Investments) (Details) (USD $)
In Thousands, unless otherwise specified
0 Months Ended 12 Months Ended
May 01, 2008
Nov. 29, 2014
Nov. 30, 2013
Dec. 01, 2012
Investment [Line Items]        
Investment in affiliate   $ 1,073us-gaap_PaymentsToAcquireInterestInSubsidiariesAndAffiliates $ 615us-gaap_PaymentsToAcquireInterestInSubsidiariesAndAffiliates $ 1,023us-gaap_PaymentsToAcquireInterestInSubsidiariesAndAffiliates
Equity Method Investee [Member]        
Investment [Line Items]        
Equity method investment, ownership percentage 30.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= us-gaap_EquityMethodInvesteeMember
     
Name of Investment BioProcess H2O LLC      
Equity method investment, aggregate cost 4,000us-gaap_EquityMethodInvestmentAggregateCost
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= us-gaap_EquityMethodInvesteeMember
     
Equity method investments   2,918us-gaap_EquityMethodInvestments
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= us-gaap_EquityMethodInvesteeMember
3,097us-gaap_EquityMethodInvestments
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= us-gaap_EquityMethodInvesteeMember
 
Cost-method Investments [Member]        
Investment [Line Items]        
Name of Investment BioProcess Algae LLC      
Cost method investment, ownership percentage 14.85%clc_CostMethodInvestmentOwnershipPercentage
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CostmethodInvestmentsMember
     
Investment in affiliate   1,073us-gaap_PaymentsToAcquireInterestInSubsidiariesAndAffiliates
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CostmethodInvestmentsMember
392us-gaap_PaymentsToAcquireInterestInSubsidiariesAndAffiliates
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CostmethodInvestmentsMember
1,114us-gaap_PaymentsToAcquireInterestInSubsidiariesAndAffiliates
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CostmethodInvestmentsMember
Cost method investments   3,277us-gaap_CostMethodInvestments
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CostmethodInvestmentsMember
2,204us-gaap_CostMethodInvestments
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CostmethodInvestmentsMember
 
Investment income, dividend   $ 0us-gaap_InvestmentIncomeDividend
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CostmethodInvestmentsMember
$ 0us-gaap_InvestmentIncomeDividend
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CostmethodInvestmentsMember
$ 1,200us-gaap_InvestmentIncomeDividend
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CostmethodInvestmentsMember