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Long-Term Debt (Schedule of Long-Term Debt) (Details) (USD $)
Dec. 27, 2014
Dec. 28, 2013
Jun. 26, 2014
Jan. 18, 2013
Debt Instrument [Line Items]        
Total long-term debt $ 1,234,339,000us-gaap_DebtAndCapitalLeaseObligations $ 1,185,525,000us-gaap_DebtAndCapitalLeaseObligations    
Less current maturities (4,355,000)us-gaap_LongTermDebtAndCapitalLeaseObligationsCurrent (9,174,000)us-gaap_LongTermDebtAndCapitalLeaseObligationsCurrent    
Long-term debt 1,229,984,000us-gaap_LongTermDebtAndCapitalLeaseObligations 1,176,351,000us-gaap_LongTermDebtAndCapitalLeaseObligations    
Line of credit [Member] | ABL Facility due 2017 [Member]        
Debt Instrument [Line Items]        
Total long-term debt 134,700,000us-gaap_DebtAndCapitalLeaseObligations
/ us-gaap_DebtInstrumentAxis
= cvo_AblRevolvingCreditFacilityMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
121,400,000us-gaap_DebtAndCapitalLeaseObligations
/ us-gaap_DebtInstrumentAxis
= cvo_AblRevolvingCreditFacilityMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
   
Junior subordinated debt [Member] | 8.500% junior secured priority notes due 2022 [Member]        
Debt Instrument [Line Items]        
Total long-term debt 245,384,000us-gaap_DebtAndCapitalLeaseObligations
/ us-gaap_DebtInstrumentAxis
= cvo_A8.500JuniorSecuredPriorityNotesDue2022Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_JuniorSubordinatedDebtMember
0us-gaap_DebtAndCapitalLeaseObligations
/ us-gaap_DebtInstrumentAxis
= cvo_A8.500JuniorSecuredPriorityNotesDue2022Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_JuniorSubordinatedDebtMember
   
Debt interest rate (percent) 8.50%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= cvo_A8.500JuniorSecuredPriorityNotesDue2022Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_JuniorSubordinatedDebtMember
  8.50%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= cvo_A8.500JuniorSecuredPriorityNotesDue2022Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_JuniorSubordinatedDebtMember
 
Long-term debt, outstanding principal amount 248,000,000us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_DebtInstrumentAxis
= cvo_A8.500JuniorSecuredPriorityNotesDue2022Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_JuniorSubordinatedDebtMember
0us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_DebtInstrumentAxis
= cvo_A8.500JuniorSecuredPriorityNotesDue2022Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_JuniorSubordinatedDebtMember
   
Senior notes [Member] | 6.000% senior secured priority notes due 2019 [Member]        
Debt Instrument [Line Items]        
Total long-term debt 534,552,000us-gaap_DebtAndCapitalLeaseObligations
/ us-gaap_DebtInstrumentAxis
= cvo_A6.000SeniorSecuredPriorityNotesDue2019Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
0us-gaap_DebtAndCapitalLeaseObligations
/ us-gaap_DebtInstrumentAxis
= cvo_A6.000SeniorSecuredPriorityNotesDue2019Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
   
Debt interest rate (percent) 6.00%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= cvo_A6.000SeniorSecuredPriorityNotesDue2019Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
  6.00%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= cvo_A6.000SeniorSecuredPriorityNotesDue2019Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
 
Long-term debt, outstanding principal amount 540,000,000us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_DebtInstrumentAxis
= cvo_A6.000SeniorSecuredPriorityNotesDue2019Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
0us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_DebtInstrumentAxis
= cvo_A6.000SeniorSecuredPriorityNotesDue2019Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
   
Senior subordinated notes [Member] | 8.875% senior second lien notes due 2018 [Member]        
Debt Instrument [Line Items]        
Total long-term debt 0us-gaap_DebtAndCapitalLeaseObligations
/ us-gaap_DebtInstrumentAxis
= cvo_A8875SeniorSecondLienNotesDue2018Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorSubordinatedNotesMember
398,326,000us-gaap_DebtAndCapitalLeaseObligations
/ us-gaap_DebtInstrumentAxis
= cvo_A8875SeniorSecondLienNotesDue2018Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorSubordinatedNotesMember
   
Debt interest rate (percent) 8.875%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= cvo_A8875SeniorSecondLienNotesDue2018Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorSubordinatedNotesMember
8.875%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ 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
 
Long-term debt [Member] | Term loan facility due 2017 [Member]        
Debt Instrument [Line Items]        
Total long-term debt 0us-gaap_DebtAndCapitalLeaseObligations
/ us-gaap_DebtInstrumentAxis
= cvo_Termloanfacilitydue2017Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LongTermDebtMember
326,013,000us-gaap_DebtAndCapitalLeaseObligations
/ us-gaap_DebtInstrumentAxis
= cvo_Termloanfacilitydue2017Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LongTermDebtMember
   
Long-term debt, outstanding principal amount 0us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_DebtInstrumentAxis
= cvo_Termloanfacilitydue2017Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LongTermDebtMember
329,100,000.0us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_DebtInstrumentAxis
= cvo_Termloanfacilitydue2017Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LongTermDebtMember
327,300,000us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_DebtInstrumentAxis
= cvo_Termloanfacilitydue2017Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LongTermDebtMember
 
Unsecured debt [Member] | 15% unsecured term loan due 2017 [Member]        
Debt Instrument [Line Items]        
Total long-term debt 0us-gaap_DebtAndCapitalLeaseObligations
/ us-gaap_DebtInstrumentAxis
= cvo_A15UnsecuredTermLoanDue2017Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_UnsecuredDebtMember
9,500,000us-gaap_DebtAndCapitalLeaseObligations
/ us-gaap_DebtInstrumentAxis
= cvo_A15UnsecuredTermLoanDue2017Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_UnsecuredDebtMember
   
Debt interest rate (percent)   15.00%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= cvo_A15UnsecuredTermLoanDue2017Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_UnsecuredDebtMember
  15.00%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= cvo_A15UnsecuredTermLoanDue2017Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_UnsecuredDebtMember
Long-term debt, outstanding principal amount 0us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_DebtInstrumentAxis
= cvo_A15UnsecuredTermLoanDue2017Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_UnsecuredDebtMember
10,000,000us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_DebtInstrumentAxis
= cvo_A15UnsecuredTermLoanDue2017Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_UnsecuredDebtMember
   
Secured debt [Member] | 11.5% senior notes due 2017 [Member]        
Debt Instrument [Line Items]        
Total long-term debt 218,011,000us-gaap_DebtAndCapitalLeaseObligations
/ us-gaap_DebtInstrumentAxis
= cvo_A115SeniorNotesDue2017Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SecuredDebtMember
219,068,000us-gaap_DebtAndCapitalLeaseObligations
/ us-gaap_DebtInstrumentAxis
= cvo_A115SeniorNotesDue2017Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SecuredDebtMember
   
Debt interest rate (percent) 11.50%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= cvo_A115SeniorNotesDue2017Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SecuredDebtMember
     
Long-term debt, outstanding principal amount 222,300,000.0us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_DebtInstrumentAxis
= cvo_A115SeniorNotesDue2017Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SecuredDebtMember
225,000,000us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_DebtInstrumentAxis
= cvo_A115SeniorNotesDue2017Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SecuredDebtMember
   
Convertible debt [Member] | 7% senior exchangeable notes due 2017 [Member]        
Debt Instrument [Line Items]        
Total long-term debt 83,250,000us-gaap_DebtAndCapitalLeaseObligations
/ us-gaap_DebtInstrumentAxis
= cvo_A7SeniorExchangeableNotesDue2017Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_ConvertibleDebtMember
86,250,000us-gaap_DebtAndCapitalLeaseObligations
/ us-gaap_DebtInstrumentAxis
= cvo_A7SeniorExchangeableNotesDue2017Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_ConvertibleDebtMember
   
Debt interest rate (percent) 7.00%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= cvo_A7SeniorExchangeableNotesDue2017Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_ConvertibleDebtMember
     
Other debt including capital leases [Member] | Other debt including capital leases [Member]        
Debt Instrument [Line Items]        
Total long-term debt $ 18,442,000us-gaap_DebtAndCapitalLeaseObligations
/ us-gaap_DebtInstrumentAxis
= cvo_OtherDebtIncludingCapitalLeasesMember
/ us-gaap_LongtermDebtTypeAxis
= cvo_OtherDebtIncludingCapitalLeasesMember
$ 24,968,000us-gaap_DebtAndCapitalLeaseObligations
/ us-gaap_DebtInstrumentAxis
= cvo_OtherDebtIncludingCapitalLeasesMember
/ us-gaap_LongtermDebtTypeAxis
= cvo_OtherDebtIncludingCapitalLeasesMember