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Segment Information - Property, Plant and Equipment, Net (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 27, 2014
Dec. 28, 2013
Geographic Information For Property Plant And Equipment [Line Items]    
Property, plant and equipment, net $ 81,566us-gaap_PropertyPlantAndEquipmentNet $ 79,668us-gaap_PropertyPlantAndEquipmentNet
United States [Member]    
Geographic Information For Property Plant And Equipment [Line Items]    
Property, plant and equipment, net 79,025us-gaap_PropertyPlantAndEquipmentNet
/ us-gaap_StatementGeographicalAxis
= country_US		 76,850us-gaap_PropertyPlantAndEquipmentNet
/ us-gaap_StatementGeographicalAxis
= country_US
Other Americas [Member]    
Geographic Information For Property Plant And Equipment [Line Items]    
Property, plant and equipment, net 196us-gaap_PropertyPlantAndEquipmentNet
/ us-gaap_StatementGeographicalAxis
= infn_OtherAmericasMember		 319us-gaap_PropertyPlantAndEquipmentNet
/ us-gaap_StatementGeographicalAxis
= infn_OtherAmericasMember
Asia Pacific [Member]    
Geographic Information For Property Plant And Equipment [Line Items]    
Property, plant and equipment, net 1,477us-gaap_PropertyPlantAndEquipmentNet
/ us-gaap_StatementGeographicalAxis
= us-gaap_AsiaPacificMember		 1,451us-gaap_PropertyPlantAndEquipmentNet
/ us-gaap_StatementGeographicalAxis
= us-gaap_AsiaPacificMember
EMEA [Member]    
Geographic Information For Property Plant And Equipment [Line Items]    
Property, plant and equipment, net $ 868us-gaap_PropertyPlantAndEquipmentNet
/ us-gaap_StatementGeographicalAxis
= us-gaap_EMEAMember		 $ 1,048us-gaap_PropertyPlantAndEquipmentNet
/ us-gaap_StatementGeographicalAxis
= us-gaap_EMEAMember