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Income Taxes (Narrative) (Details) (USD $)
 3 Months Ended 12 Months Ended
Dec. 28, 2013
Dec. 27, 2014
Dec. 28, 2013
Dec. 29, 2012
Operating Loss Carryforwards [Line Items]        
Valuation allowance, change in deferred tax asset $ 40,600,000us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount   $ 40,600,000us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount $ 56,500,000us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount
Net operating loss carryforwards 108,580,000us-gaap_DeferredTaxAssetsOperatingLossCarryforwards 132,958,000us-gaap_DeferredTaxAssetsOperatingLossCarryforwards 108,580,000us-gaap_DeferredTaxAssetsOperatingLossCarryforwards  
Foreign tax credit carryforwards 7,456,000us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsForeign 7,013,000us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsForeign 7,456,000us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsForeign  
Alternative minimum tax credit carryforwards 8,242,000us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsAlternativeMinimumTax 7,706,000us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsAlternativeMinimumTax 8,242,000us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsAlternativeMinimumTax  
Valuation allowance 110,754,000us-gaap_DeferredTaxAssetsValuationAllowance 160,080,000us-gaap_DeferredTaxAssetsValuationAllowance 110,754,000us-gaap_DeferredTaxAssetsValuationAllowance  
Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense [Abstract]        
Unrecognized tax benefits that would impact effective tax rate   2,200,000us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate    
Unrecognized tax benefits, interest on income taxes expense   300,000us-gaap_UnrecognizedTaxBenefitsInterestOnIncomeTaxesExpense    
Unrecognized tax benefits, interest on income taxes accrued   2,500,000us-gaap_UnrecognizedTaxBenefitsInterestOnIncomeTaxesAccrued    
Income Taxes Paid, Net [Abstract]        
Income taxes receivable 600,000us-gaap_IncomeTaxesReceivable 900,000us-gaap_IncomeTaxesReceivable 600,000us-gaap_IncomeTaxesReceivable  
Income taxes paid   1,600,000us-gaap_IncomeTaxesPaid 300,000us-gaap_IncomeTaxesPaid 1,400,000us-gaap_IncomeTaxesPaid
Internal Revenue Service (IRS) [Member]        
Operating Loss Carryforwards [Line Items]        
Operating loss carryforwards   342,400,000us-gaap_OperatingLossCarryforwards
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_InternalRevenueServiceIRSMember		    
Federal and State Net Operating Loss Carry Forwards [Member]        
Operating Loss Carryforwards [Line Items]        
Valuation allowance   135,400,000us-gaap_DeferredTaxAssetsValuationAllowance
/ us-gaap_ValuationAllowanceByDeferredTaxAssetAxis
= cvo_FederalAndStateNetOperatingLossCarryForwardsMember		    
State Net Operating Loss and Foreign Tax Credit Carry Forwards [Member]        
Operating Loss Carryforwards [Line Items]        
Valuation allowance   $ 24,700,000us-gaap_DeferredTaxAssetsValuationAllowance
/ us-gaap_ValuationAllowanceByDeferredTaxAssetAxis
= cvo_StateNetOperatingLossandForeignTaxCreditCarryforwardsMember