Summary of Reorganization Item and Fresh -Start Accounting Adjustments (Detail) (USD $) In Thousands, unless otherwise specified	5 Months Ended
May 31, 2010
Pretax reorganization items:
Professional and other fees	$ 48,701
Gain on prepetition settlement	(49,980)
Gain on settlement of liabilities subject to compromise	(162,243)
Reorganization items and fresh start accounting adjustments gross	(163,522)
Pretax fresh-start accounting adjustments	(139,931)
Reorganization items and fresh-start accounting adjustments, net	$ (303,453)

Gain or loss on settlement of liabilities subject to compromise.

No definition available.

Name:	cosh_GainOrLossOnSettlementOfLiabilitiesSubjectToCompromise
Namespace Prefix:	cosh_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Pretax fresh start accounting adjustments income.

+ References

No definition available.

+ Details

Name:	cosh_PretaxFreshStartAccountingAdjustmentsIncome
Namespace Prefix:	cosh_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Reorganization item and fresh start accounting adjustments net.

+ References

No definition available.

+ Details

Name:	cosh_ReorganizationItemAndFreshStartAccountingAdjustmentsNet
Namespace Prefix:	cosh_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Reorganization items and fresh-start accounting adjustments, Gross.

+ References

No definition available.

+ Details

Name:	cosh_ReorganizationItemsAndFreshStartAccountingAdjustmentsGross
Namespace Prefix:	cosh_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Amount of net gain (loss) on settlement of other claims for entities in bankruptcy, reported as a reorganization item.

+ References

+ Details

Name:	us-gaap_DebtorReorganizationItemsGainLossOnSettlementOfOtherClaimsNet1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Amount of reorganization items related to legal and advisory professional fees related to entities in bankruptcy.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 852

-SubTopic 10

-Section 55

-Paragraph 3

-URI http://asc.fasb.org/extlink&oid=6585303&loc=d3e56145-112766

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 852

-SubTopic 10

-Section 45

-Paragraph 9

-URI http://asc.fasb.org/extlink&oid=6916575&loc=d3e55730-112764

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

-Publisher AICPA

-Name Statement of Position (SOP)

-Number 90-7

-Paragraph 27

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

- Details

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