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- Definition

Gross Tax Benefits Related To Share Based Compensation, Not Included In Deferred Tax Assets

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Net Operating Loss Carryforwards Change In Ownership Minimum

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- Definition

Offset To Deferred Tax Assets For Unrecognized Tax Benefits

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TaxBenefitsRelatedToShareBasedCompensationNotIncludedInDeferredTaxAssets

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- Definition

Unrecognized Tax Benefits Net

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- Definition

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

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

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- Definition

This element represents the income or loss from continuing operations attributable to the economic entity which may also be defined as revenue less expenses from ongoing operations, after income or loss from equity method investments, but before income taxes, extraordinary items, and noncontrolling interest.

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The portion of earnings or loss from continuing operations before income taxes that is attributable to foreign operations, which is defined as Income or Loss generated from operations located outside the entity's country of domicile.

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

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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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Amount of undistributed earnings of foreign subsidiaries intended to be permanently reinvested outside the country of domicile.

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Amount of unrecognized tax benefits pertaining to uncertain tax positions taken in tax returns.

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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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Amount of expense 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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Income Taxes - Additional Information (Detail) (USD $)	3 Months Ended								12 Months Ended
Income Taxes - Additional Information (Detail) (USD $)	Dec. 27, 2014	Sep. 27, 2014	Jun. 28, 2014	Mar. 29, 2014	Dec. 28, 2013	Sep. 28, 2013	Jun. 29, 2013	Mar. 30, 2013	Dec. 27, 2014	Dec. 28, 2013	Dec. 29, 2012	Dec. 31, 2011
Income before provision for income taxes from international operations									$ 5,600,000	$ 5,800,000	$ 5,500,000
Provision for income taxes	1,683,000us-gaap_IncomeTaxExpenseBenefit	205,000us-gaap_IncomeTaxExpenseBenefit	617,000us-gaap_IncomeTaxExpenseBenefit	248,000us-gaap_IncomeTaxExpenseBenefit	414,000us-gaap_IncomeTaxExpenseBenefit	308,000us-gaap_IncomeTaxExpenseBenefit	601,000us-gaap_IncomeTaxExpenseBenefit	331,000us-gaap_IncomeTaxExpenseBenefit	2,753,000us-gaap_IncomeTaxExpenseBenefit	1,654,000us-gaap_IncomeTaxExpenseBenefit	2,190,000us-gaap_IncomeTaxExpenseBenefit
Loss before provision of income taxes	10,093,000	5,048,000	5,397,000	(4,126,000)	(9,764,000)	3,655,000	(9,408,000)	(14,948,000)	16,412,000	(30,465,000)	(83,140,000)
Effective tax rate									16.80%	(5.40%)	(2.60%)
Federal statutory rate									35.00%	35.00%	35.00%
Estimated tax benefits									17,800,000
Cumulative ownership change									50.00%
Undistributed earnings	20,300,000								20,300,000
Cumulative unrecognized tax benefit	16,978,000us-gaap_UnrecognizedTaxBenefits				15,148,000us-gaap_UnrecognizedTaxBenefits				16,978,000us-gaap_UnrecognizedTaxBenefits	15,148,000us-gaap_UnrecognizedTaxBenefits	13,902,000us-gaap_UnrecognizedTaxBenefits	13,066,000us-gaap_UnrecognizedTaxBenefits
Unrecognized tax benefits netted against deferred tax assets									15,100,000
Unrecognized tax benefits	1,800,000infn_UnrecognizedTaxBenefitsNet								1,800,000infn_UnrecognizedTaxBenefitsNet
Accrued interest or penalties related to unrecognized tax benefits	400,000				200,000				400,000	200,000	200,000
Accrued interest or penalty included in income tax									200,000	100,000	100,000
Net operating losses carryforward federal [Member]
Operating loss carryforwards	309,100,000								309,100,000
Net operating losses carryforward state [Member]
Operating loss carryforwards	278,700,000								278,700,000
Federal research and development credits [Member]
Research credits	28,000,000								28,000,000
Federal research credits, beginning expiration period									2021
California research and development credits [Member]
Research credits	29,300,000								29,300,000
Scientific Research And Experimental Development (SRED) Credits [Member]
Research credits	2,100,000								2,100,000
Federal [Member]
Unbenefited stock option deductions									42,000,000
California [Member]
Unbenefited stock option deductions									$ 37,800,000