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Goodwill and Other Intangible Assets (Intangible Assets) (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 28, 2015
Dec. 27, 2014
Finite-Lived Intangible Assets [Abstract]    
Weighted Average Remaining Amortization Period (Years) 11 years  
Gross Carrying Amount $ 230,406us-gaap_FiniteLivedIntangibleAssetsGross $ 230,440us-gaap_FiniteLivedIntangibleAssetsGross
Accumulated Impairment Charges (82,601)cvo_FiniteLivedIntangibleAssetsAccumulatedImpairmentCharges (82,601)cvo_FiniteLivedIntangibleAssetsAccumulatedImpairmentCharges
Accumulated Amortization (77,451)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization (75,035)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
Total Net Carrying Amount 70,354us-gaap_FiniteLivedIntangibleAssetsNet 72,804us-gaap_FiniteLivedIntangibleAssetsNet
Intangible Assets, Net (Excluding Goodwill) [Abstract]    
Gross Carrying Amount 315,306us-gaap_IntangibleAssetsGrossExcludingGoodwill 315,340us-gaap_IntangibleAssetsGrossExcludingGoodwill
Accumulated Impairment Charges (82,601)cvo_IntangibleAssetsAccumulatedImpairmentChargesExcludingGoodwill (82,601)cvo_IntangibleAssetsAccumulatedImpairmentChargesExcludingGoodwill
Accumulated Amortization (77,451)cvo_IntangibleAssetsAccumulatedAmortizationExcludingGoodwill (75,035)cvo_IntangibleAssetsAccumulatedAmortizationExcludingGoodwill
Net Carrying Amount 155,254us-gaap_IntangibleAssetsNetExcludingGoodwill 157,704us-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 144,693us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerRelationshipsMember
144,732us-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 (64,376)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerRelationshipsMember
(62,202)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerRelationshipsMember
Total Net Carrying Amount 53,083us-gaap_FiniteLivedIntangibleAssetsNet
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerRelationshipsMember
55,296us-gaap_FiniteLivedIntangibleAssetsNet
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerRelationshipsMember
Trademarks and trade names [Member]    
Finite-Lived Intangible Assets [Abstract]    
Weighted Average Remaining Amortization Period (Years) 21 years  
Gross Carrying Amount 77,755us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_TrademarksAndTradeNamesMember
77,750us-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 (9,560)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_TrademarksAndTradeNamesMember
(9,383)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_TrademarksAndTradeNamesMember
Total Net Carrying Amount 12,828us-gaap_FiniteLivedIntangibleAssetsNet
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_TrademarksAndTradeNamesMember
13,000us-gaap_FiniteLivedIntangibleAssetsNet
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_TrademarksAndTradeNamesMember
Leasehold 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
4,430us-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 (348)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_OffMarketFavorableLeaseMember
(291)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_OffMarketFavorableLeaseMember
Total Net Carrying Amount 4,082us-gaap_FiniteLivedIntangibleAssetsNet
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_OffMarketFavorableLeaseMember
4,139us-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 (3,167)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_PatentsMember
(3,159)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_PatentsMember
Total Net Carrying Amount $ 361us-gaap_FiniteLivedIntangibleAssetsNet
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_PatentsMember
$ 369us-gaap_FiniteLivedIntangibleAssetsNet
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_PatentsMember