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Balance Sheet Details - Details of Selected Balance Sheet Items (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 27, 2014
Dec. 28, 2013
Inventory:    
Raw materials $ 15,169us-gaap_InventoryRawMaterials $ 14,311us-gaap_InventoryRawMaterials
Work in process 50,046us-gaap_InventoryWorkInProcess 49,172us-gaap_InventoryWorkInProcess
Finished goods 81,285us-gaap_InventoryFinishedGoods [1] 60,202us-gaap_InventoryFinishedGoods [1]
Total 146,500us-gaap_InventoryNet [2] 123,685us-gaap_InventoryNet [2]
Property, plant and equipment, net:    
Property, plant and equipment 242,364us-gaap_PropertyPlantAndEquipmentGross 219,724us-gaap_PropertyPlantAndEquipmentGross
Less accumulated depreciation and amortization (160,798)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment [3] (140,056)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment [3]
Total 81,566us-gaap_PropertyPlantAndEquipmentNet 79,668us-gaap_PropertyPlantAndEquipmentNet
Accrued expenses:    
Loss contingency related to non-cancelable purchase commitments 5,390infn_LossContingencyRelatedToNonCancelablePurchaseCommitments 5,120infn_LossContingencyRelatedToNonCancelablePurchaseCommitments
Professional and other consulting fees 1,831us-gaap_AccruedProfessionalFeesCurrent 1,411us-gaap_AccruedProfessionalFeesCurrent
Taxes payable 3,993us-gaap_TaxesPayableCurrent 2,372us-gaap_TaxesPayableCurrent
Royalties 2,648us-gaap_AccruedRoyaltiesCurrent 1,540us-gaap_AccruedRoyaltiesCurrent
Accrued rebate and customer prepay liability 941infn_AccruedRebateAndCustomerPrepayLiabilityCurrent 3,807infn_AccruedRebateAndCustomerPrepayLiabilityCurrent
Accrued interest on convertible senior notes 219us-gaap_InterestAndDividendsPayableCurrent 219us-gaap_InterestAndDividendsPayableCurrent
Other accrued expenses 11,419us-gaap_OtherAccruedLiabilitiesCurrent 7,962us-gaap_OtherAccruedLiabilitiesCurrent
Total 26,441us-gaap_AccruedLiabilitiesCurrent 22,431us-gaap_AccruedLiabilitiesCurrent
Enterprise resource planning [Member]    
Property, plant and equipment, net:    
Property, plant and equipment 7,900us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= infn_EnterpriseResourcePlanningSystemsMember		 7,900us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= infn_EnterpriseResourcePlanningSystemsMember
Total 5,200us-gaap_PropertyPlantAndEquipmentNet
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= infn_EnterpriseResourcePlanningSystemsMember		 6,300us-gaap_PropertyPlantAndEquipmentNet
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= infn_EnterpriseResourcePlanningSystemsMember
Computer hardware [Member]    
Property, plant and equipment, net:    
Property, plant and equipment 8,785us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_ComputerEquipmentMember		 9,692us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_ComputerEquipmentMember
Computer software [Member]    
Property, plant and equipment, net:    
Property, plant and equipment 17,684us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_ComputerSoftwareIntangibleAssetMember		 [4] 16,988us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_ComputerSoftwareIntangibleAssetMember		 [4]
Laboratory and manufacturing equipment [Member]    
Property, plant and equipment, net:    
Property, plant and equipment 162,004us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= infn_LaboratoryAndManufacturingEquipmentMember		 146,834us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= infn_LaboratoryAndManufacturingEquipmentMember
Furniture and fixtures [Member]    
Property, plant and equipment, net:    
Property, plant and equipment 1,340us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_FurnitureAndFixturesMember		 1,347us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_FurnitureAndFixturesMember
Leasehold improvements [Member]    
Property, plant and equipment, net:    
Property, plant and equipment 37,825us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_LeaseholdImprovementsMember		 35,913us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_LeaseholdImprovementsMember
Construction in progress [Member]    
Property, plant and equipment, net:    
Property, plant and equipment $ 14,726us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_ConstructionInProgressMember		 $ 8,950us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_ConstructionInProgressMember
[1] Included in finished goods inventory at December 27, 2014 and December 28, 2013 were $10.2 million and $9.2 million, respectively, of inventory at customer locations for which product acceptance had not occurred.
[2] As of December 27, 2014 and December 28, 2013, the Company’s inventory value had been reduced by $10.1 million and $8.7 million, respectively, for excess and obsolescence, and $7.1 million and $5.0 million, respectively, for LCM adjustments.
[3] Depreciation expense was $25.9 million, $24.5 million and $23.5 million (which includes depreciation of capitalized ERP costs of $1.1 million, $1.1 million and $0.4 million, respectively) for 2014, 2013 and 2012, respectively.
[4] Included in computer software at December 27, 2014 and December 28, 2013 were $7.9 million and $7.9 million, respectively, related to an enterprise resource planning (“ERP”) system that the Company implemented during 2012. The unamortized ERP costs at December 27, 2014 and December 28, 2013 were $5.2 million and $6.3 million, respectively.