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Stock-Based Compensation (Narrative) (Details) (USD $)
12 Months Ended 0 Months Ended
Dec. 27, 2014
Dec. 28, 2013
Dec. 29, 2012
May 01, 2013
May 01, 2014
May 31, 2008
Narrative Disclosures [Abstract]            
Stock-based compensation provision $ 2,420,000us-gaap_ShareBasedCompensation $ 3,739,000us-gaap_ShareBasedCompensation $ 5,333,000us-gaap_ShareBasedCompensation      
Stock compensation, tax benefit 600,000us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense 700,000us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense 1,200,000us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense      
Unrecognized share based compensation expense 700,000us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized          
Unrecognized share based compensation costs, amortization period (years) 2 years 1 month 2 days          
Stock Options [Member]            
Narrative Disclosures [Abstract]            
Maximum remaining contractual term (years) 6 years          
Vesting period (years) 4 years          
Restricted Stock Units (RSUs) [Member]            
Narrative Disclosures [Abstract]            
Vesting period (years) 4 years   1 year      
RSU fair value $ 1,700,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
$ 1,600,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
$ 2,000,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
     
Shares granted (shares) 88,236us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
549,500us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
136,840us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
     
Performance Shares [Member]            
Narrative Disclosures [Abstract]            
Shares granted (shares) 0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
  0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
730,500us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
   
2007 Long-term Equity Incentive Plan [Member]            
Narrative Disclosures [Abstract]            
Number of shares authorized for issuance (shares)           4,500,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
/ us-gaap_PlanNameAxis
= cvo_A2007LongTermEquityIncentivePlanMember
2007 Long-term Equity Incentive Plan [Member] | Stock Options [Member]            
Narrative Disclosures [Abstract]            
Number of additional shares authorized for issuance (shares)   1,040,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfAdditionalSharesAuthorized
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_PlanNameAxis
= cvo_A2007LongTermEquityIncentivePlanMember
       
Director [Member] | Restricted Stock Units (RSUs) [Member]            
Narrative Disclosures [Abstract]            
Vesting period (years)   1 year     1 year  
Shares granted (shares)   130,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
/ us-gaap_TitleOfIndividualAxis
= us-gaap_DirectorMember
    88,236us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
/ us-gaap_TitleOfIndividualAxis
= us-gaap_DirectorMember
 
Executives [Member] | Restricted Stock Units (RSUs) [Member]            
Narrative Disclosures [Abstract]            
Vesting period (years)   4 years        
Shares granted (shares)   419,500us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
/ us-gaap_TitleOfIndividualAxis
= us-gaap_ManagementMember