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Condensed Consolidating Financial Information (Narrative) (Details)
Dec. 27, 2014
Jun. 26, 2014
Dec. 28, 2013
6.000% senior secured priority notes due 2019 [Member] | Senior notes [Member]      
Condensed Financial Statements, Captions [Line Items]      
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		  
8.500% junior secured priority notes due 2022 [Member] | Junior subordinated debt [Member]      
Condensed Financial Statements, Captions [Line Items]      
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		  
7.875% senior subordinated notes, due 2013 [Member] | Senior subordinated notes [Member]      
Condensed Financial Statements, Captions [Line Items]      
Debt interest rate (percent) 7.875%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= cvo_A7875SeniorSubordinatedNotesDue2013Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorSubordinatedNotesMember		    
8.875% senior second lien notes due 2018 [Member] | Senior subordinated notes [Member]      
Condensed Financial Statements, Captions [Line Items]      
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
7% senior exchangeable notes due 2017 [Member] | Convertible debt [Member]      
Condensed Financial Statements, Captions [Line Items]      
Debt interest rate (percent) 7.00%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= cvo_A7SeniorExchangeableNotesDue2017Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_ConvertibleDebtMember		    
11.5% senior notes due 2017 [Member] | Secured debt [Member]      
Condensed Financial Statements, Captions [Line Items]      
Debt interest rate (percent) 11.50%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= cvo_A115SeniorNotesDue2017Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SecuredDebtMember