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Long-Term Debt (8.875% Notes) (Details) (USD $)
12 Months Ended 0 Months Ended
Dec. 27, 2014
Dec. 28, 2013
Dec. 29, 2012
Feb. 05, 2010
Jun. 26, 2014
Debt Instrument [Line Items]          
Proceeds from issuance of 8.500% junior secured priority notes due 2022 $ 250,000,000us-gaap_ProceedsFromIssuanceOfSubordinatedLongTermDebt $ 0us-gaap_ProceedsFromIssuanceOfSubordinatedLongTermDebt $ 0us-gaap_ProceedsFromIssuanceOfSubordinatedLongTermDebt    
Payments of debt issuance costs 37,994,000us-gaap_PaymentsOfDebtIssuanceCosts 15,570,000us-gaap_PaymentsOfDebtIssuanceCosts 37,836,000us-gaap_PaymentsOfDebtIssuanceCosts    
Senior subordinated notes [Member] | 8.875% senior second lien notes due 2018 [Member]          
Debt Instrument [Line Items]          
Proceeds from issuance of 8.500% junior secured priority notes due 2022       400,000,000us-gaap_ProceedsFromIssuanceOfSubordinatedLongTermDebt
/ 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
 
Redemption price percentage if there was a change of control (percent)       101.00%cvo_RedemptionPricePercentageIfThereWasChangeOfControl
/ us-gaap_DebtInstrumentAxis
= cvo_A8875SeniorSecondLienNotesDue2018Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorSubordinatedNotesMember
 
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
 
Payments of debt issuance costs, offering expenses       1,800,000cvo_PaymentsofDebtIssuanceCostsOfferingExpenses
/ us-gaap_DebtInstrumentAxis
= cvo_A8875SeniorSecondLienNotesDue2018Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorSubordinatedNotesMember
 
Long-term debt, outstanding principal amount 0us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_DebtInstrumentAxis
= cvo_A8875SeniorSecondLienNotesDue2018Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorSubordinatedNotesMember
400,000,000us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_DebtInstrumentAxis
= cvo_A8875SeniorSecondLienNotesDue2018Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorSubordinatedNotesMember
    400,000,000us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_DebtInstrumentAxis
= cvo_A8875SeniorSecondLienNotesDue2018Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorSubordinatedNotesMember
Loans payable [Member] | Term Loan, due 2013 [Member]          
Debt Instrument [Line Items]          
Debt extinguishment amount       300,000,000us-gaap_ExtinguishmentOfDebtAmount
/ us-gaap_DebtInstrumentAxis
= cvo_TermLoanDue2013Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LoansPayableMember
 
Line of credit [Member] | Revolving credit facility, due 2012 [Member]          
Debt Instrument [Line Items]          
Debt extinguishment amount       $ 88,000,000us-gaap_ExtinguishmentOfDebtAmount
/ us-gaap_DebtInstrumentAxis
= cvo_RevolvingCreditFacilityDue2012Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
 
Maximum [Member] | Senior subordinated notes [Member] | 8.875% senior second lien notes due 2018 [Member]          
Debt Instrument [Line Items]          
Debt redemption price (percentage)       104.40%us-gaap_DebtInstrumentRedemptionPricePercentage
/ us-gaap_DebtInstrumentAxis
= cvo_A8875SeniorSecondLienNotesDue2018Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorSubordinatedNotesMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
 
Minimum [Member] | Senior subordinated notes [Member] | 8.875% senior second lien notes due 2018 [Member]          
Debt Instrument [Line Items]          
Debt redemption price (percentage)       100.00%us-gaap_DebtInstrumentRedemptionPricePercentage
/ us-gaap_DebtInstrumentAxis
= cvo_A8875SeniorSecondLienNotesDue2018Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorSubordinatedNotesMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember