Debt (Revolving Credit Facility) (Details) (USD $) In Millions, unless otherwise specified	6 Months Ended
Jun. 26, 2011
Senior Secured Credit Facility [Member] \| Maximum [Member]
Leverage ratio	2.75
Senior Secured Credit Facility [Member] \| Minimum [Member]
Fixed charge coverage ratio	1.25
Senior Secured Credit Facility [Member]
Expansion option under credit facility	50.0
Potential total commitment with expansion option	175.0
Letters of credit sublimit	25.0
Percentage of stock pledge of domestic subsidiaries	100.00%
Percentage of stock pledge of all first-tier foreign subsidiaries	65.00%
Letter of Credit [Member]
Letters of credit outstanding	1.4
Swingline Loan [Member]
Swingline loans sublimit	15.0

Expansion option under senior secured credit facility.

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Namespace Prefix:	ckp
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Minimum fixed charge coverage ratio

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Namespace Prefix:	ckp
Data Type:	xbrli:decimalItemType
Balance Type:	na
Period Type:	duration

Sublimit for issuance of letters of credit under senior secured credit facility

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Namespace Prefix:	ckp
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Maximum total leverage ratio

Percentage of stock pledge of all first-tier foreign subsidiaries

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Namespace Prefix:	ckp
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

Percentage of stock pledge of domestic subsidiaries

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Namespace Prefix:	ckp
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

Potential total commitment with expansion option under senior secured credit facility.

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Namespace Prefix:	ckp
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Sublimit for issuance of swingline loans under senior secured credit facility

Name:	ckp_SwinglineLoansSublimit
Namespace Prefix:	ckp
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

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Namespace Prefix:	us-gaap
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant