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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to income exempt from income tax because of a tax holiday.

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to income exempt from income tax because of a tax holiday.

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Amount of operating loss carryforward, before tax effects, available to reduce future taxable income under enacted tax laws.

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Expiration date of each operating loss carryforward included in operating loss carryforward, in CCYY-MM-DD format.

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Amount of asset related to consideration paid in advance for costs that provide economic benefits within a future period of one year or the normal operating cycle, if longer.

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The amount of the tax credit carryforward, before tax effects, available to reduce future taxable income under enacted tax laws.

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The earnings that is allocated to common stock and participating securities to the extent that each security may share in earnings as if all of the earnings for the period had been distributed. Includes the adjustments resulting from the assumption that dilutive securities were converted, options or warrants were exercised, or that other shares were issued upon the satisfaction of certain conditions.

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Amount accrued for interest on an underpayment of income taxes and penalties related to a tax position claimed or expected to be claimed in the tax return.

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The total amount of unrecognized tax benefits that, if recognized, would affect the effective tax rate.

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The amount of the change in the period in the valuation allowance for a specified deferred tax asset.

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Income Taxes (Narrative) (Details) (USD $)	12 Months Ended
Income Taxes (Narrative) (Details) (USD $)	Dec. 27, 2014	Dec. 28, 2013	Dec. 29, 2012
Income Taxes [Line Items]
Provision for income taxes	$ 14,412,000us-gaap_IncomeTaxExpenseBenefit	$ 25,756,000us-gaap_IncomeTaxExpenseBenefit	$ 37,301,000us-gaap_IncomeTaxExpenseBenefit
Federal statutory rate	35.00%	35.00%	35.00%
Prepaid Expense, Current	100,000us-gaap_PrepaidExpenseCurrent
Increase (decrease) in valuation allowance	(5,600,000)	37,100,000
Undistributed earnings	177,200,000us-gaap_UndistributedEarningsDiluted
Unrecognized tax benefits that, if recognized, would affect the effective tax rate	41,300,000	43,300,000	37,300,000
Accrued interest and penalties related to unrecognized tax benefits	3,500,000	3,300,000	3,900,000
Federal Domestic And Foreign [Member]
Income Taxes [Line Items]
Net operating loss carryforwards	134,200,000
Net operating loss carryforwards, expiration dates	Dec. 31, 2023
State [Member]
Income Taxes [Line Items]
Net operating loss carryforwards	184,100,000
Tax credit carryforward, 2015	49,500,000
Foreign Tax Authority [Member]
Income Taxes [Line Items]
Effective tax rate on holidays	0.00%
Income tax holiday savings	2,700,000	3,900,000	7,900,000
Net operating loss carryforwards	46,300,000
Federal research and development credits [Member]
Income Taxes [Line Items]
Net operating loss carryforwards, expiration dates		Dec. 31, 2017
Tax credit carryforward		26,400,000
Foreign Research and experimental development credits [Member]
Income Taxes [Line Items]
Net operating loss carryforwards, expiration dates		Dec. 31, 2029
Tax credit carryforward		75,900,000
Research [Member] \| State [Member]
Income Taxes [Line Items]
Tax credit carryforward		15,900,000
Federal Alternative Minimum [Member]
Income Taxes [Line Items]
Tax credit carryforward		4,500,000
Foreign Tax Credits [Member]
Income Taxes [Line Items]
Net operating loss carryforwards, expiration dates	Dec. 31, 2017
Tax credit carryforward		32,500,000
Additional Paid In Capital [Member] \| Federal [Member]
Income Taxes [Line Items]
Net operating loss carryforwards	123,900,000
Additional Paid In Capital [Member] \| State [Member]
Income Taxes [Line Items]
Net operating loss carryforwards	112,200,000
Additional Paid In Capital [Member] \| Foreign Tax Credits [Member]
Income Taxes [Line Items]
Tax credit carryforward		9,000,000
Israel Subsidiary [Member]
Income Taxes [Line Items]
Provision for income taxes	$ 6,900,000