Amount received upon termination of the swaps due to de-designation as hedged items.

No definition available.

Name:	jny_AmountReceivedUponTerminationOfSwaps
Namespace Prefix:	jny_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Total amount recognized in interest expense related to derivatives.

+ References

No definition available.

+ Details

Name:	jny_IncreaseDecreaseInInterestExpenseRelatedToDerivatives
Namespace Prefix:	jny_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The number of interest rate swap transactions entered into.

+ References

No definition available.

+ Details

Name:	jny_NumberOfInterestRateSwapTransactions
Namespace Prefix:	jny_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

- Definition

Amount of the hedged item as of the balance sheet date related to the derivative. For example, the hedged balance on a debt instrument.

+ References

No definition available.

+ Details

Name:	us-gaap_DerivativeAmountOfHedgedItem
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	na
Period Type:	instant

- Definition

Cap rate on an interest rate derivative such as an interest rate cap or collar. If market rates exceed the cap rate, a payment or receipt is triggered on the contract.

+ References

No definition available.

+ Details

Name:	us-gaap_DerivativeCapInterestRate
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

The reference rate for the variable rate of the interest rate derivative, such as LIBOR or the US Treasury rate and the maturity of the reference rate used, such as three months or six months LIBOR.

+ References

No definition available.

+ Details

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

- Definition

Fair value of derivative asset, presented on a gross basis even when the derivative instrument is subject to master netting arrangements and qualifies for net presentation in the statement of financial position.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 50

-Paragraph 4B

-Subparagraph (a),(c)

-URI http://asc.fasb.org/extlink&oid=6935481&loc=SL5624163-113959

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 133

-Paragraph 44C

-Subparagraph a

-Clause 1

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 133

-Paragraph 205G

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

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

- Definition

Fixed interest rate related to the interest rate derivative.

+ References

No definition available.

+ Details

Name:	us-gaap_DerivativeFixedInterestRate
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

+ References

+ Details

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

- Details

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

- Details

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

- Definition

The net gain (loss) recognized in earnings during the period due to the ineffectiveness on interest rate fair value hedges.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 133

-Paragraph 45

-Subparagraph a(1)

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 25

-Section 50

-Paragraph 1

-Subparagraph (a)(1)

-URI http://asc.fasb.org/extlink&oid=6886632&loc=d3e76258-113986

+ Details

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

- Definition

Amount of unrealized gain (loss) included in earnings for the period related to the fair value of the hedged item in an interest rate fair value hedge, which was offset by the gain (loss) on the hedging instrument to the extent that the fair value hedge is determined to be effective.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 133

-Paragraph 45

-Subparagraph a(1)

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 50

-Paragraph 4A

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=6935481&loc=SL5618551-113959

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 50

-Paragraph 4C

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=6935481&loc=SL5624171-113959

+ Details

Name:	us-gaap_IncreaseDecreaseInFairValueOfHedgedItemInInterestRateFairValueHedge
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Aggregate notional amount of foreign currency exchange rate derivatives. Notional amount refers to the number of currency units specified in the foreign currency derivative contract.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Notional Amount

-URI http://asc.fasb.org/extlink&oid=6519104

+ Details

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

DERIVATIVES Part I (Details) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended																		12 Months Ended		6 Months Ended	12 Months Ended
	Jun. 30, 2012 USD ($)	Jul. 02, 2011 USD ($)	Jun. 30, 2012 USD ($)	Jul. 02, 2011 USD ($)	Mar. 07, 2011	Jun. 30, 2012 Designated as Hedging Instrument [Member] USD ($)	Dec. 31, 2011 Designated as Hedging Instrument [Member] USD ($)	Jul. 02, 2011 Designated as Hedging Instrument [Member] USD ($)	Jun. 30, 2012 Not Designated as Hedging Instrument [Member] USD ($)	Dec. 31, 2011 Not Designated as Hedging Instrument [Member] USD ($)	Jul. 02, 2011 Not Designated as Hedging Instrument [Member] USD ($)	Dec. 31, 2011 Interest Rate Swap Contracts [Member] Other Long Term Assets [Member] Designated as Hedging Instrument [Member] USD ($)	Jul. 02, 2011 Interest Rate Swap Contracts [Member] Other Long Term Assets [Member] Designated as Hedging Instrument [Member] USD ($)	Jul. 02, 2011 Foreign Exchange Contract [Member] Accrued Expenses and Other Current Liabilities [Member] Designated as Hedging Instrument [Member] USD ($)	Jun. 30, 2012 Foreign Exchange Contract [Member] Prepaid expenses and other current assets [Member] Designated as Hedging Instrument [Member] USD ($)	Dec. 31, 2011 Foreign Exchange Contract [Member] Prepaid expenses and other current assets [Member] Designated as Hedging Instrument [Member] USD ($)	Jun. 30, 2012 Foreign Exchange Contract [Member] Prepaid expenses and other current assets [Member] Not Designated as Hedging Instrument [Member] USD ($)	Jul. 02, 2011 Foreign Exchange Contract [Member] Prepaid expenses and other current assets [Member] Not Designated as Hedging Instrument [Member] USD ($)	Dec. 31, 2011 Interest Rate Cap Contract [Member] Other Long Term Assets [Member] Not Designated as Hedging Instrument [Member] USD ($)	Jul. 02, 2011 Interest Rate Cap Contract [Member] Other Long Term Assets [Member] Not Designated as Hedging Instrument [Member] USD ($)	Dec. 31, 2010 Interest Rate Swaps on 2014 Notes [Member] USD ($)	Dec. 17, 2010 Interest Rate Swaps on 2014 Notes [Member] USD ($)	Jun. 30, 2012 Interest Rate Swaps on 2019 Notes [Member] USD ($)	Dec. 31, 2011 Interest Rate Swaps on 2019 Notes [Member] USD ($)	Mar. 21, 2012 Interest Rate Swaps on 2019 Notes [Member] USD ($)	Mar. 07, 2011 Interest Rate Swaps on 2019 Notes [Member] USD ($)	Jun. 30, 2012 British Pound - U.S. Dollar Forward Exchange Contracts [Member] GBP (£)	Jul. 02, 2011 British Pound - U.S. Dollar Exchange Options [Member] USD ($)	Jun. 30, 2012 Canadian Dollar- U.S. forward exchange contracts [Member] USD ($)	Dec. 31, 2011 Canadian Dollar- U.S. forward exchange contracts [Member] USD ($)	Jul. 02, 2011 Canadian Dollar- U.S. forward exchange contracts [Member] USD ($)	Jul. 02, 2011 British Pound - Euro forward exchange contract [Member] EUR (€)
Derivative [Line Items]
Number of interest rate swap transactions					3																	3			3	3
Amount of hedged item related to derivative																						$ 250			$ 150	$ 150
Fixed interest rate related to derivative																						5.125%			6.875%	6.875%
Variable interest rate related to derivative																					three-month LIBOR rates (which are reset on the 15th day of each calendar quarter) plus 3.46%		one-month LIBOR rates (which were reset on the 15th day of each calendar quarter) plus 5.195%	based on three-month LIBOR rates (which are reset on the 15th day of each calendar quarter) plus 3.73%
Interest rate cap																						5.00%
Amount received upon termination of swaps																					5.7		3.5	8.1
Change in interest expense related to ineffectiveness of swap	(0.2)	(0.9)	1.3	1.2
Change in interest expense related to changes in the fair value of interest rate cap	0	0.5	0.2	0.7
Net (decrease) increase in interest expense	(0.2)	(0.4)	1.5	1.9
Notional amounts of foreign exchange contracts outstanding																											3.0	2.5	10.2	5.3	10.3	2.4
Derivatives, Fair Value [Line Items]
Total derivative assets						0.1	5.6	5.1	0.1	0.2	0.7	5.5	5.1		0.1	0.1	0.1	0.1	0.2	0.6
Total derivative liabilities								$ 0.6						$ 0.6