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Earnings Per Share (Schedule Of Anti-dilutive Common Share Equivalents) (Details)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 28, 2014
Dec. 29, 2013
Dec. 30, 2012
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]      
Weighted average potential common shares associated with anti-dilutive stock options and restricted stock units excluded from the computation of diluted EPS(1) 1,959us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount 2,368us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount 3,107us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
Stock Options And Awards      
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]      
Weighted average potential common shares associated with anti-dilutive stock options and restricted stock units excluded from the computation of diluted EPS(1)   361us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
/ us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis
= us-gaap_EmployeeStockOptionMember
61us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
/ us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis
= us-gaap_EmployeeStockOptionMember
Deferred Compensation Arrangement      
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]      
Weighted average potential common shares associated with anti-dilutive stock options and restricted stock units excluded from the computation of diluted EPS(1)   21us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
/ us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis
= ckp_DeferredCompensationArrangementMember
12us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
/ us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis
= ckp_DeferredCompensationArrangementMember