Share-Based Compensation - Shares Available for Grants as Stock Options or Other Share-Based Awards (Details)	6 Months Ended
Aug. 01, 2015 shares
Disclosure Shares Available For Grants As Stock Options Or Other Share Based Awards [Abstract]
Available for grant beginning balance	13,623,070
Granted	(1,035,000)
Forfeited and available for reissuance	8,317,500
Available for grant ending balance	20,905,570

Disclosure shares available for grants as stock options or other share based awards.

No definition available.

Name:	jcg_DisclosureSharesAvailableForGrantsAsStockOptionsOrOtherShareBasedAwardsAbstract
Namespace Prefix:	jcg_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Share based compensation arrangement by share based payment award number of shares available for grant forfeited and available for reissuance number of shares.

+ References

No definition available.

+ Details

Name:	jcg_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrantForfeitedAndAvailableForReissuanceNumberOfShares
Namespace Prefix:	jcg_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

- Definition

Share based compensation arrangement by share based payment award number of shares available for grant granted number of shares.

+ References

No definition available.

+ Details

Name:	jcg_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrantGrantedNumberOfShares
Namespace Prefix:	jcg_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

- Definition

The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

+ Details

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant