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Long-Term Debt (2010 Credit Facilities) (Details) (USD $)
 12 Months Ended 0 Months Ended
Dec. 27, 2014
Dec. 28, 2013
Dec. 29, 2012
Dec. 11, 2013
Mar. 09, 2012
Feb. 03, 2012
Mar. 05, 2012
Feb. 05, 2010
Dec. 14, 2012
Jun. 08, 2012
Feb. 28, 2014
Apr. 16, 2013
Jan. 18, 2013
Debt Instrument [Line Items]                          
Payments of debt issuance costs $ 37,994,000us-gaap_PaymentsOfDebtIssuanceCosts $ 15,570,000us-gaap_PaymentsOfDebtIssuanceCosts $ 37,836,000us-gaap_PaymentsOfDebtIssuanceCosts                    
Repayments of debt 329,100,000us-gaap_RepaymentsOfLongTermDebt 30,900,000us-gaap_RepaymentsOfLongTermDebt 0us-gaap_RepaymentsOfLongTermDebt                    
Long-term debt [Member] | Term loan facility due 2017 [Member]                          
Debt Instrument [Line Items]                          
Debt instrument, face amount                       360,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= cvo_Termloanfacilitydue2017Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LongTermDebtMember		  
Debt, unamortized discount                     1,500,000us-gaap_DebtInstrumentUnamortizedDiscount
/ us-gaap_DebtInstrumentAxis
= cvo_Termloanfacilitydue2017Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LongTermDebtMember		    
Repayments of debt       28,200,000us-gaap_RepaymentsOfLongTermDebt
/ us-gaap_DebtInstrumentAxis
= cvo_Termloanfacilitydue2017Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LongTermDebtMember		                  
Long-term debt [Member] | $15 Million Term Loan Add-On [Member]                          
Debt Instrument [Line Items]                          
Debt instrument, face amount                 15,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= cvo_A15MillionTermLoanAddOnMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LongTermDebtMember		        
Long-term debt [Member] | $65 Million Term Loan Add-On [Member]                          
Debt Instrument [Line Items]                          
Debt instrument, face amount                   65,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= cvo_A65MillionTermLoanAddOnMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LongTermDebtMember		      
Debt, unamortized discount                   700,000us-gaap_DebtInstrumentUnamortizedDiscount
/ us-gaap_DebtInstrumentAxis
= cvo_A65MillionTermLoanAddOnMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LongTermDebtMember		      
Long-term debt [Member] | Term Loan B, due 2016 [Member]                          
Debt Instrument [Line Items]                          
Payments of debt issuance costs, fees paid to consenting lenders           1,700,000cvo_PaymentsofDebtIssuanceCostsFeesPaidtoConsentingLenders
/ us-gaap_DebtInstrumentAxis
= cvo_TermLoanBDue2016Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LongTermDebtMember		              
Percentage of net proceeds used to pay down debt (percent)           25.00%cvo_PercentageOfNetProceedsUsedToPayDownDebt
/ us-gaap_DebtInstrumentAxis
= cvo_TermLoanBDue2016Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LongTermDebtMember		              
Repayments of debt         34,700,000us-gaap_RepaymentsOfLongTermDebt
/ us-gaap_DebtInstrumentAxis
= cvo_TermLoanBDue2016Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LongTermDebtMember		 9,500,000us-gaap_RepaymentsOfLongTermDebt
/ us-gaap_DebtInstrumentAxis
= cvo_TermLoanBDue2016Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LongTermDebtMember		              
Line of credit [Member] | Revolving credit facility due 2014 [Member]                          
Debt Instrument [Line Items]                          
Payments of debt issuance costs             1,000,000us-gaap_PaymentsOfDebtIssuanceCosts
/ us-gaap_DebtInstrumentAxis
= cvo_RevolvingCreditFacilityDue2014Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember		            
Credit facility, borrowing capacity             150,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_DebtInstrumentAxis
= cvo_RevolvingCreditFacilityDue2014Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember		         170,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_DebtInstrumentAxis
= cvo_RevolvingCreditFacilityDue2014Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember		 170,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_DebtInstrumentAxis
= cvo_RevolvingCreditFacilityDue2014Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
Senior subordinated notes [Member] | 7.875% senior subordinated notes, due 2013 [Member]                          
Debt Instrument [Line Items]                          
Debt, repurchase limit                   135,000,000cvo_DebtInstrumentRepurchaseLimit
/ us-gaap_DebtInstrumentAxis
= cvo_A7875SeniorSubordinatedNotesDue2013Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorSubordinatedNotesMember		      
Senior subordinated notes [Member] | 8.875% senior second lien notes due 2018 [Member]                          
Debt Instrument [Line Items]                          
Payments of debt issuance costs               9,400,000us-gaap_PaymentsOfDebtIssuanceCosts
/ us-gaap_DebtInstrumentAxis
= cvo_A8875SeniorSecondLienNotesDue2018Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorSubordinatedNotesMember		          
Payments of debt issuance costs, fees paid to consenting lenders               7,600,000cvo_PaymentsofDebtIssuanceCostsFeesPaidtoConsentingLenders
/ us-gaap_DebtInstrumentAxis
= cvo_A8875SeniorSecondLienNotesDue2018Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorSubordinatedNotesMember		          
Debt, unamortized discount               2,800,000us-gaap_DebtInstrumentUnamortizedDiscount
/ us-gaap_DebtInstrumentAxis
= cvo_A8875SeniorSecondLienNotesDue2018Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorSubordinatedNotesMember		          
Percentage of net proceeds used to pay down debt (percent)           75.00%cvo_PercentageOfNetProceedsUsedToPayDownDebt
/ us-gaap_DebtInstrumentAxis
= cvo_A8875SeniorSecondLienNotesDue2018Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorSubordinatedNotesMember		              
Line of Credit and Loans Payable [Member] | 2010 Credit Facilities [Member]                          
Debt Instrument [Line Items]                          
Payments of debt issuance costs                 2,700,000us-gaap_PaymentsOfDebtIssuanceCosts
/ us-gaap_DebtInstrumentAxis
= cvo_A2010CreditFacilitiesMember
/ us-gaap_LongtermDebtTypeAxis
= cvo_LineOfCreditAndLoanPayableMember		        
Payments of debt issuance costs, fees paid to consenting lenders                 2,600,000cvo_PaymentsofDebtIssuanceCostsFeesPaidtoConsentingLenders
/ us-gaap_DebtInstrumentAxis
= cvo_A2010CreditFacilitiesMember
/ us-gaap_LongtermDebtTypeAxis
= cvo_LineOfCreditAndLoanPayableMember		        
Line of Credit and Loans Payable [Member] | Term Loan B and Revolving Credit Facility Due 2014 [Member]                          
Debt Instrument [Line Items]                          
Payments of debt issuance costs                   1,100,000us-gaap_PaymentsOfDebtIssuanceCosts
/ us-gaap_DebtInstrumentAxis
= cvo_TermLoanBAndRevolvingCreditFacilityMember
/ us-gaap_LongtermDebtTypeAxis
= cvo_LineOfCreditAndLoanPayableMember		      
Line of Credit and Loans Payable [Member] | $65 Million Term Loan Add-On [Member]                          
Debt Instrument [Line Items]                          
Payments of debt issuance costs                   2,000,000us-gaap_PaymentsOfDebtIssuanceCosts
/ us-gaap_DebtInstrumentAxis
= cvo_A65MillionTermLoanAddOnMember
/ us-gaap_LongtermDebtTypeAxis
= cvo_LineOfCreditAndLoanPayableMember		      
Payments of debt issuance costs, fees paid to consenting lenders                   $ 1,800,000cvo_PaymentsofDebtIssuanceCostsFeesPaidtoConsentingLenders
/ us-gaap_DebtInstrumentAxis
= cvo_A65MillionTermLoanAddOnMember
/ us-gaap_LongtermDebtTypeAxis
= cvo_LineOfCreditAndLoanPayableMember