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Goodwill and Other Intangible Assets (Schedule of Intangible Assets) (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 27, 2014
Dec. 28, 2013
Finite-Lived Intangible Assets [Abstract]    
Weighted Average Remaining Amortization Period (Years) 11 years  
Gross Carrying Amount $ 230,440us-gaap_FiniteLivedIntangibleAssetsGross $ 230,100us-gaap_FiniteLivedIntangibleAssetsGross
Accumulated Impairment Charges (82,601)cvo_FiniteLivedIntangibleAssetsAccumulatedImpairmentCharges (82,601)cvo_FiniteLivedIntangibleAssetsAccumulatedImpairmentCharges
Accumulated Amortization (75,035)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization (63,650)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
Total Net Carrying Amount 72,804us-gaap_FiniteLivedIntangibleAssetsNet 83,849us-gaap_FiniteLivedIntangibleAssetsNet
Intangible Assets, Net (Excluding Goodwill) [Abstract]    
Gross Carrying Amount 315,340us-gaap_IntangibleAssetsGrossExcludingGoodwill 315,000us-gaap_IntangibleAssetsGrossExcludingGoodwill
Accumulated Impairment Charges (82,601)cvo_IntangibleAssetsAccumulatedImpairmentChargesExcludingGoodwill (82,601)cvo_IntangibleAssetsAccumulatedImpairmentChargesExcludingGoodwill
Accumulated Amortization (75,035)cvo_IntangibleAssetsAccumulatedAmortizationExcludingGoodwill (63,650)cvo_IntangibleAssetsAccumulatedAmortizationExcludingGoodwill
Net Carrying Amount 157,704us-gaap_IntangibleAssetsNetExcludingGoodwill 168,749us-gaap_IntangibleAssetsNetExcludingGoodwill
Trademarks [Member]    
Indefinite-Lived Intangible Assets (Excluding Goodwill) [Abstract]    
Gross Carrying Amount 84,900cvo_IndefiniteLivedIntangibleAssetsGross
/ us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_TrademarksMember
84,900cvo_IndefiniteLivedIntangibleAssetsGross
/ us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_TrademarksMember
Accumulated Impairment Charges 0cvo_IndefiniteLivedIntangibleAssetsAccumulatedImpairmentCharges
/ us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_TrademarksMember
0cvo_IndefiniteLivedIntangibleAssetsAccumulatedImpairmentCharges
/ us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_TrademarksMember
Net Carrying Amount 84,900us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill
/ us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_TrademarksMember
84,900us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill
/ us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_TrademarksMember
Customer relationships [Member]    
Finite-Lived Intangible Assets [Abstract]    
Weighted Average Remaining Amortization Period (Years) 8 years  
Gross Carrying Amount 144,732us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerRelationshipsMember
144,898us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerRelationshipsMember
Accumulated Impairment Charges (27,234)cvo_FiniteLivedIntangibleAssetsAccumulatedImpairmentCharges
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerRelationshipsMember
(27,234)cvo_FiniteLivedIntangibleAssetsAccumulatedImpairmentCharges
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerRelationshipsMember
Accumulated Amortization (62,202)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerRelationshipsMember
(53,682)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerRelationshipsMember
Total Net Carrying Amount 55,296us-gaap_FiniteLivedIntangibleAssetsNet
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerRelationshipsMember
63,982us-gaap_FiniteLivedIntangibleAssetsNet
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerRelationshipsMember
Trademarks and trade names [Member]    
Finite-Lived Intangible Assets [Abstract]    
Weighted Average Remaining Amortization Period (Years) 22 years  
Gross Carrying Amount 77,750us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_TrademarksAndTradeNamesMember
77,754us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_TrademarksAndTradeNamesMember
Accumulated Impairment Charges (55,367)cvo_FiniteLivedIntangibleAssetsAccumulatedImpairmentCharges
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_TrademarksAndTradeNamesMember
(55,367)cvo_FiniteLivedIntangibleAssetsAccumulatedImpairmentCharges
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_TrademarksAndTradeNamesMember
Accumulated Amortization (9,383)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_TrademarksAndTradeNamesMember
(6,734)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_TrademarksAndTradeNamesMember
Total Net Carrying Amount 13,000us-gaap_FiniteLivedIntangibleAssetsNet
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_TrademarksAndTradeNamesMember
15,653us-gaap_FiniteLivedIntangibleAssetsNet
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_TrademarksAndTradeNamesMember
Leashold interests [Member]    
Finite-Lived Intangible Assets [Abstract]    
Weighted Average Remaining Amortization Period (Years) 18 years  
Gross Carrying Amount 4,430us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_OffMarketFavorableLeaseMember
3,780us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_OffMarketFavorableLeaseMember
Accumulated Impairment Charges 0cvo_FiniteLivedIntangibleAssetsAccumulatedImpairmentCharges
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_OffMarketFavorableLeaseMember
0cvo_FiniteLivedIntangibleAssetsAccumulatedImpairmentCharges
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_OffMarketFavorableLeaseMember
Accumulated Amortization (291)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_OffMarketFavorableLeaseMember
(55)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_OffMarketFavorableLeaseMember
Total Net Carrying Amount 4,139us-gaap_FiniteLivedIntangibleAssetsNet
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_OffMarketFavorableLeaseMember
3,725us-gaap_FiniteLivedIntangibleAssetsNet
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_OffMarketFavorableLeaseMember
Patents [Member]    
Finite-Lived Intangible Assets [Abstract]    
Weighted Average Remaining Amortization Period (Years) 11 years  
Gross Carrying Amount 3,528us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_PatentsMember
3,528us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_PatentsMember
Accumulated Impairment Charges 0cvo_FiniteLivedIntangibleAssetsAccumulatedImpairmentCharges
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_PatentsMember
0cvo_FiniteLivedIntangibleAssetsAccumulatedImpairmentCharges
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_PatentsMember
Accumulated Amortization (3,159)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_PatentsMember
(3,039)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_PatentsMember
Total Net Carrying Amount 369us-gaap_FiniteLivedIntangibleAssetsNet
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_PatentsMember
489us-gaap_FiniteLivedIntangibleAssetsNet
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_PatentsMember
Non-compete agreements [Member]    
Finite-Lived Intangible Assets [Abstract]    
Gross Carrying Amount 0us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_NoncompeteAgreementsMember
140us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_NoncompeteAgreementsMember
Accumulated Impairment Charges 0cvo_FiniteLivedIntangibleAssetsAccumulatedImpairmentCharges
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_NoncompeteAgreementsMember
0cvo_FiniteLivedIntangibleAssetsAccumulatedImpairmentCharges
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_NoncompeteAgreementsMember
Accumulated Amortization 0us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_NoncompeteAgreementsMember
(140)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_NoncompeteAgreementsMember
Total Net Carrying Amount $ 0us-gaap_FiniteLivedIntangibleAssetsNet
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_NoncompeteAgreementsMember
$ 0us-gaap_FiniteLivedIntangibleAssetsNet
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_NoncompeteAgreementsMember