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Guarantees - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 27, 2014
Dec. 28, 2013
Guarantor Obligations [Line Items]    
Standby letters of credit outstanding 5.0infn_OutstandingStandbyLettersOfCredit $ 3.5infn_OutstandingStandbyLettersOfCredit
Value added tax license 3.0infn_ValueAddedTaxLicense 1.4infn_ValueAddedTaxLicense
Customer proposal guarantee 1.3infn_CustomerProposalGuarantee 1.4infn_CustomerProposalGuarantee
Property leases 0.7infn_PropertyLeases $ 0.7infn_PropertyLeases
Minimum [Member]    
Guarantor Obligations [Line Items]    
Hardware warranty period 1 year  
Maximum [Member]    
Guarantor Obligations [Line Items]    
Hardware warranty period 5 years