Income Taxes (Deferred Tax Assets And Liabilities) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 28, 2014	Dec. 29, 2013
Income Tax Disclosure [Abstract]
Inventory	$ 3,821us-gaap_DeferredTaxAssetsInventory	$ 4,472us-gaap_DeferredTaxAssetsInventory
Accounts receivable	1,093	2,279
Capitalized research and development costs	23,938	22,986
Financing liability	7,276ckp_DeferredTaxAssetFinancingLiability	9,168ckp_DeferredTaxAssetFinancingLiability
Net operating loss and foreign tax credit carryforwards	88,442	101,396
Interest carryforward	4,661	6,691
Deferred revenue	1,455us-gaap_DeferredTaxAssetsDeferredIncome	988us-gaap_DeferredTaxAssetsDeferredIncome
Pension	17,967	13,221
Uncertain tax positions	11,628	11,190
Deferred compensation	3,278	2,871
Stock based compensation	8,861	8,756
Depreciation	1,623	1,851
Other	4,557us-gaap_DeferredTaxAssetsOther	4,847us-gaap_DeferredTaxAssetsOther
Valuation allowance	(148,838)	(145,508)
Deferred tax assets	29,762us-gaap_DeferredTaxAssetsNet	45,208us-gaap_DeferredTaxAssetsNet
Intangibles	10,831	10,756
Unremitted earnings	6,177us-gaap_DeferredTaxLiabilitiesOther	2,983us-gaap_DeferredTaxLiabilitiesOther
Deferred tax liabilities	17,008us-gaap_DeferredTaxLiabilities	13,739us-gaap_DeferredTaxLiabilities
Net deferred tax assets	$ 12,754us-gaap_DeferredTaxAssetsLiabilitiesNet	$ 31,469us-gaap_DeferredTaxAssetsLiabilitiesNet

Deferred Tax Asset, Financing Liability

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Deferred Tax Asset, Interest Carryforward

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Deferred Tax Asset, Uncertain Tax Positions

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from deferred income.

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from in-process research and development costs expensed in connection with a business combination.

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from inventory.

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Amount after allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards, net of deferred tax liability attributable to taxable temporary differences.

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Amount after allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards.

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible operating loss carryforwards.

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences not separately disclosed.

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from employee compensation.

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from pension benefits.

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from share-based compensation.

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from other provisions, reserves, allowances, and accruals not separately disclosed.

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-Glossary Deferred Tax Asset

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from the allowance for doubtful accounts.

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Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized.

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Amount of deferred tax liability attributable to taxable temporary differences net of deferred tax asset attributable to deductible temporary differences and carryforwards after valuation allowances.

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Amount of deferred tax liability attributable to taxable temporary differences from intangible assets including goodwill.

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Amount of deferred tax liability attributable to taxable temporary differences not separately disclosed.

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