Line of Credit Facility, Additional Borrowing Capacity

No definition available.

Name:	cvo_LineofCreditFacilityAdditionalBorrowingCapacity
Namespace Prefix:	cvo_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Long-term Debt, Quarterly Amortization Percentage

+ References

No definition available.

+ Details

Name:	cvo_LongtermDebtQuarterlyAmortizationPercentage
Namespace Prefix:	cvo_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Incremental percentage increase (decrease) in the stated rate on a debt instrument.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentInterestRateIncreaseDecrease
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Maximum contractual interest rate for funds borrowed, under the debt agreement.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(1))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 02
-Paragraph 22
-Article 5

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Minimum contractual interest rate for funds borrowed, under the debt agreement.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(2))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 02
-Paragraph 22
-Article 5

+ Details

Name:	us-gaap_DebtInstrumentInterestRateStatedPercentageRateRangeMinimum
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

The amount of debt discount that was originally recognized at the issuance of the instrument that has yet to be amortized.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 1A
-URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28541-108399

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 55
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=34725769&loc=d3e28878-108400

+ Details

Name:	us-gaap_DebtInstrumentUnamortizedDiscount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

The fee, expressed as a percentage of the line of credit facility, for the line of credit facility regardless of whether the facility has been used.

+ References

No definition available.

+ Details

Name:	us-gaap_LineOfCreditFacilityCommitmentFeePercentage
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.19(b),22(b))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 02
-Paragraph 19, 22
-Article 5

+ Details

Name:	us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The cash outflow for debt initially having maturity due after one year or beyond the normal operating cycle, if longer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 15
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3291-108585

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Financing Activities
-URI http://asc.fasb.org/extlink&oid=6513228

+ Details

Name:	us-gaap_RepaymentsOfLongTermDebt
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

The remaining balance of debt issuance expenses that were capitalized and are being amortized against income over the lives of the respective bond issues. This does not include the amounts capitalized as part of the cost of the utility plant or asset.

+ References

+ Details

Name:	us-gaap_UnamortizedDebtIssuanceExpense
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Details

Name:	us-gaap_LongtermDebtTypeAxis=us-gaap_LineOfCreditMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=cvo_RevolvingCreditFacilityDue2014Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=cvo_AblRevolvingCreditFacilityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LongtermDebtTypeAxis=us-gaap_LongTermDebtMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=cvo_A2013CreditFacilitiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=cvo_Termloanfacilitydue2017Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

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- Details

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- Details

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- Details

Name:	us-gaap_VariableRateAxis=us-gaap_PrimeRateMember
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Long-Term Debt (2013 Credit Facilities) (Details) - USD ($)			12 Months Ended
	Dec. 11, 2013	Apr. 16, 2013	Jan. 02, 2016	Dec. 27, 2014	Dec. 28, 2013	Jan. 30, 2015	Feb. 28, 2014
Debt Instrument [Line Items]
Unamortized debt issuance costs			$ 18,900,000	$ 25,200,000
Repayments of debt			0	329,100,000	$ 30,900,000
Line of credit [Member] \| Revolving credit facility due 2014 [Member]
Debt Instrument [Line Items]
Credit facility, borrowing capacity		$ 170,000,000
Line of credit [Member] \| ABL Facility due 2017 [Member]
Debt Instrument [Line Items]
Credit facility, borrowing capacity		200,000,000				$ 240,000,000
Unamortized debt issuance costs	$ 300,000		$ 2,300,000	$ 3,000,000		1,300,000
Additional borrowing capacity	30,000,000					$ 10,000,000
Long-term debt [Member] \| 2013 Credit Facilities [Member]
Debt Instrument [Line Items]
Unamortized debt issuance costs		7,200,000
Debt, unamortized discount		$ 1,800,000
Long-term debt [Member] \| Term loan facility due 2017 [Member]
Debt Instrument [Line Items]
Debt, unamortized discount							$ 1,500,000
Debt, minimum required annual principal payment percentage (percent)		1.00%
Repayments of debt	$ 28,200,000
Minimum [Member] \| Line of credit [Member] \| ABL Facility due 2017 [Member]
Debt Instrument [Line Items]
Commitment fee percentage (percent)		0.375%
Maximum [Member] \| Line of credit [Member] \| ABL Facility due 2017 [Member]
Debt Instrument [Line Items]
Commitment fee percentage (percent)		0.50%
LIBOR [Member] \| Line of credit [Member] \| ABL Facility due 2017 [Member]
Debt Instrument [Line Items]
Debt, interest rate, minimum (percent)		2.00%
Debt, interest rate, maximum (percent)		2.50%
LIBOR [Member] \| Long-term debt [Member] \| Term loan facility due 2017 [Member]
Debt Instrument [Line Items]
Debt, interest rate, minimum (percent)		1.25%
Debt, interest rate increase (percent)		5.00%
Prime Rate [Member] \| Line of credit [Member] \| ABL Facility due 2017 [Member]
Debt Instrument [Line Items]
Debt, interest rate, minimum (percent)		1.00%
Debt, interest rate, maximum (percent)		1.50%
Prime Rate [Member] \| Long-term debt [Member] \| Term loan facility due 2017 [Member]
Debt Instrument [Line Items]
Debt, interest rate, minimum (percent)		2.25%
Debt, interest rate increase (percent)		4.00%