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:	xbrli:pureItemType
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 SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 22

-Article 5

Reference 2: 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

+ Details

Name:	us-gaap_DebtInstrumentInterestRateStatedPercentageRateRangeMaximum
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 SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 22

-Article 5

Reference 2: 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

+ Details

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

- 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=6584090&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 paid to third parties in connection with debt origination, which will be amortized over the remaining maturity period of the associated long-term debt.

+ References

+ Details

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

- 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

- Details

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

- Details

Name:	us-gaap_RangeAxis=us-gaap_MinimumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_VariableRateAxis=us-gaap_LondonInterbankOfferedRateLIBORMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_VariableRateAxis=us-gaap_PrimeRateMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Long-Term Debt (2013 Credit Facilities) (Details) (USD $)	12 Months Ended			0 Months Ended
	Dec. 27, 2014	Dec. 28, 2013	Dec. 29, 2012	Mar. 05, 2012	Dec. 11, 2013	Apr. 16, 2013	Jan. 18, 2013	Feb. 28, 2014
Debt Instrument [Line Items]
Payments of debt issuance costs	$ 37,994,000us-gaap_PaymentsOfDebtIssuanceCosts	$ 15,570,000us-gaap_PaymentsOfDebtIssuanceCosts	$ 37,836,000us-gaap_PaymentsOfDebtIssuanceCosts
Repayments of debt	329,100,000us-gaap_RepaymentsOfLongTermDebt	30,900,000us-gaap_RepaymentsOfLongTermDebt	0us-gaap_RepaymentsOfLongTermDebt
Line of credit [Member] \| Revolving credit facility due 2014 [Member]
Debt Instrument [Line Items]
Credit facility, borrowing capacity				150,000,000		170,000,000	170,000,000
Payments of debt issuance costs				1,000,000
Line of credit [Member] \| ABL Facility due 2017 [Member]
Debt Instrument [Line Items]
Credit facility, borrowing capacity	230,000,000
Payments of debt issuance costs					300,000
Additional borrowing capacity					30,000,000.0
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)						0.01
Repayments of debt					28,200,000
Long-term debt [Member] \| 2013 Credit Facilities [Member]
Debt Instrument [Line Items]
Payments of debt issuance costs						7,200,000
Debt, unamortized discount						$ 1,800,000
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%
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%
London Interbank Offered Rate (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%
London Interbank Offered Rate (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%