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Stockholders' Equity - Summary of Effects of Stock Based Compensation on Company's Statements of Operations (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 27, 2014
Dec. 28, 2013
Dec. 29, 2012
Effects Of Stock Based Compensation [Line Items]      
Gross share based compensation before amortization $ 24,708infn_AllocatedShareBasedCompensationExpenseBeforeAmortizationOfPriorPeriodsDeferredInventoryCost $ 26,351infn_AllocatedShareBasedCompensationExpenseBeforeAmortizationOfPriorPeriodsDeferredInventoryCost $ 35,995infn_AllocatedShareBasedCompensationExpenseBeforeAmortizationOfPriorPeriodsDeferredInventoryCost
Cost of revenue—amortization from balance sheet 3,686infn_AmortizationOfDeferredInventoryCostRecognizedAsShareBasedCompensationExpense [1] 5,625infn_AmortizationOfDeferredInventoryCostRecognizedAsShareBasedCompensationExpense [1] 5,824infn_AmortizationOfDeferredInventoryCostRecognizedAsShareBasedCompensationExpense [1]
Total stock-based compensation expense 28,394us-gaap_AllocatedShareBasedCompensationExpense 31,976us-gaap_AllocatedShareBasedCompensationExpense 41,819us-gaap_AllocatedShareBasedCompensationExpense
Cost of revenue [Member]      
Effects Of Stock Based Compensation [Line Items]      
Gross share based compensation before amortization 1,921infn_AllocatedShareBasedCompensationExpenseBeforeAmortizationOfPriorPeriodsDeferredInventoryCost
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_CostOfSalesMember		 1,871infn_AllocatedShareBasedCompensationExpenseBeforeAmortizationOfPriorPeriodsDeferredInventoryCost
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_CostOfSalesMember		 2,710infn_AllocatedShareBasedCompensationExpenseBeforeAmortizationOfPriorPeriodsDeferredInventoryCost
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_CostOfSalesMember
Research and development [Member]      
Effects Of Stock Based Compensation [Line Items]      
Gross share based compensation before amortization 8,927infn_AllocatedShareBasedCompensationExpenseBeforeAmortizationOfPriorPeriodsDeferredInventoryCost
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_ResearchAndDevelopmentExpenseMember		 10,900infn_AllocatedShareBasedCompensationExpenseBeforeAmortizationOfPriorPeriodsDeferredInventoryCost
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_ResearchAndDevelopmentExpenseMember		 13,306infn_AllocatedShareBasedCompensationExpenseBeforeAmortizationOfPriorPeriodsDeferredInventoryCost
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_ResearchAndDevelopmentExpenseMember
Sales and marketing [Member]      
Effects Of Stock Based Compensation [Line Items]      
Gross share based compensation before amortization 7,477infn_AllocatedShareBasedCompensationExpenseBeforeAmortizationOfPriorPeriodsDeferredInventoryCost
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_SellingAndMarketingExpenseMember		 7,624infn_AllocatedShareBasedCompensationExpenseBeforeAmortizationOfPriorPeriodsDeferredInventoryCost
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_SellingAndMarketingExpenseMember		 10,450infn_AllocatedShareBasedCompensationExpenseBeforeAmortizationOfPriorPeriodsDeferredInventoryCost
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_SellingAndMarketingExpenseMember
General and administration [Member]      
Effects Of Stock Based Compensation [Line Items]      
Gross share based compensation before amortization $ 6,383infn_AllocatedShareBasedCompensationExpenseBeforeAmortizationOfPriorPeriodsDeferredInventoryCost
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_GeneralAndAdministrativeExpenseMember		 $ 5,956infn_AllocatedShareBasedCompensationExpenseBeforeAmortizationOfPriorPeriodsDeferredInventoryCost
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_GeneralAndAdministrativeExpenseMember		 $ 9,529infn_AllocatedShareBasedCompensationExpenseBeforeAmortizationOfPriorPeriodsDeferredInventoryCost
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_GeneralAndAdministrativeExpenseMember
[1] Represents stock-based compensation expense deferred to inventory and deferred inventory costs in prior periods and recognized in the current period.