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Significant Accounting Policies - Additional Information (Detail) (USD $)
 3 Months Ended 12 Months Ended 1 Months Ended
Mar. 29, 2014
Mar. 30, 2013
Mar. 31, 2012
Dec. 27, 2014
customer
Dec. 28, 2013
customer
Dec. 29, 2012
Dec. 26, 2009
Feb. 29, 2012
Jan. 31, 2012
Significant Accounting Policies [Line Items]                  
Warranty support service period       1 year          
Expected dividend yield       0.00%infn_AnnualExpectedCashDividendYield          
Revenue reserves recorded for potential sales returns       $ 200,000infn_ReserveForSalesReturns $ 100,000infn_ReserveForSalesReturns $ 1,300,000infn_ReserveForSalesReturns      
Software warranty period       90 days          
Disposal of auction rate securities par value         3,100,000infn_DisposalOfAuctionRateSecuritiesParValue        
Available for sale auction rate securities called at par value         100,000infn_AvailableForSaleAuctionRateSecuritiesCalledAtParValue        
Available for sale auction rate securities tender value         3,000,000infn_AvailableForSaleAuctionRateSecuritiesTenderValue        
Available for sale auction rate securities tender value as percent of par value         95.00%infn_AvailableForSaleAuctionRateSecuritiesTenderValueAsPercentOfParValue        
Cost-method investment       14,500,000us-gaap_CostMethodInvestments 9,000,000us-gaap_CostMethodInvestments        
Number of major customers representing accounts receivable       1infn_NumberOfMajorCustomersRepresentingAccountsReceivable 1infn_NumberOfMajorCustomersRepresentingAccountsReceivable        
Number of major customers representing total revenue       1infn_NumberOfMajorCustomersRepresentingTotalRevenue 0infn_NumberOfMajorCustomersRepresentingTotalRevenue 0infn_NumberOfMajorCustomersRepresentingTotalRevenue      
Euro and British Pound denominated receivables and typically maturities       no more than 35 days          
Foreign currency transaction loss       1,400,000infn_ForeignCurrencyTransactionGainLoss 1,400,000infn_ForeignCurrencyTransactionGainLoss 1,600,000infn_ForeignCurrencyTransactionGainLoss      
Advertising expenses $ 1,500,000us-gaap_AdvertisingExpense $ 1,300,000us-gaap_AdvertisingExpense $ 1,600,000us-gaap_AdvertisingExpense            
Minimum [Member]                  
Significant Accounting Policies [Line Items]                  
Training and installation and deployment delivered period       90 days          
Accounting receivable, payment term       30 days          
Product warranty period       1 year          
Minimum [Member] | Performance stock units [Member]                  
Significant Accounting Policies [Line Items]                  
Ranges of number of shares issued on vesting of PSUs       0infn_RangeOfSharesIssuedUponRestatedStockOptionAndIncentivePlan
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember		 0infn_RangeOfSharesIssuedUponRestatedStockOptionAndIncentivePlan
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember		   0.5infn_RangeOfSharesIssuedUponRestatedStockOptionAndIncentivePlan
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember		    
Maximum [Member]                  
Significant Accounting Policies [Line Items]                  
Training and installation and deployment delivered period       120 days          
Accounting receivable, payment term       120 days          
Product warranty period       5 years          
Maximum [Member] | Employee stock options [Member]                  
Significant Accounting Policies [Line Items]                  
Term of future options grants               7 years 10 years
Maximum [Member] | Performance stock units [Member]                  
Significant Accounting Policies [Line Items]                  
Ranges of number of shares issued on vesting of PSUs       1.5infn_RangeOfSharesIssuedUponRestatedStockOptionAndIncentivePlan
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember		 1.5infn_RangeOfSharesIssuedUponRestatedStockOptionAndIncentivePlan
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember		   2.0infn_RangeOfSharesIssuedUponRestatedStockOptionAndIncentivePlan
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember		    
Vesting, Revenue Criteria [Member] | Performance stock units [Member]                  
Significant Accounting Policies [Line Items]                  
New-hire grants, options typically vest           50.00%us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
/ us-gaap_VestingAxis
= infn_VestingRevenueCriteriaMember		      
Vesting, Operating Profit Criteria [Member] | Performance stock units [Member]                  
Significant Accounting Policies [Line Items]                  
New-hire grants, options typically vest           50.00%us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
/ us-gaap_VestingAxis
= infn_VestingOperatingProfitCriteriaMember		      
New Hire Employee [Member] | Employee stock options [Member]                  
Significant Accounting Policies [Line Items]                  
First vesting term       1 year          
Monthly vesting term       3 years          
New Hire Employee [Member] | Restricted stock units [Member]                  
Significant Accounting Policies [Line Items]                  
Term of future options grants       4 years          
New Hire Employee [Member] | Vesting First Year [Member] | Employee stock options [Member]                  
Significant Accounting Policies [Line Items]                  
New-hire grants, options typically vest       25.00%us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_TitleOfIndividualAxis
= infn_NewHireEmployeeMember
/ us-gaap_VestingAxis
= infn_VestingFirstYearMember		          
Existing Employees [Member] | Vesting 1 [Member] | Performance stock units [Member]                  
Significant Accounting Policies [Line Items]                  
Term of future options grants       1 year          
Existing Employees [Member] | Vesting 2 [Member] | Performance stock units [Member]                  
Significant Accounting Policies [Line Items]                  
Term of future options grants       2 years          
Existing Employees [Member] | Vesting 3 [Member] | Restricted stock units [Member]                  
Significant Accounting Policies [Line Items]                  
Term of future options grants       3 years          
Existing Employees [Member] | Vesting 3 [Member] | Performance stock units [Member]                  
Significant Accounting Policies [Line Items]                  
Term of future options grants       3 years          
Executive Officer [Member] | Performance stock units [Member]                  
Significant Accounting Policies [Line Items]                  
Term of future options grants           2 years 6 months      
Receivable with payment supported by an irrevocable commercial letter of credit (“LOC”) [Member] | Minimum [Member]                  
Significant Accounting Policies [Line Items]                  
Accounting receivable, payment term       120 days          
Receivable with payment supported by an irrevocable commercial letter of credit (“LOC”) [Member] | Maximum [Member]                  
Significant Accounting Policies [Line Items]                  
Accounting receivable, payment term       1 year          
Customer One [Member] | Accounts Receivable [Member] | Customer Concentration Risk [Member]                  
Significant Accounting Policies [Line Items]                  
Concentration risk       13.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_AccountsReceivableMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CustomerConcentrationRiskMember
/ us-gaap_MajorCustomersAxis
= infn_CustomerOneMember		 13.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_AccountsReceivableMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CustomerConcentrationRiskMember
/ us-gaap_MajorCustomersAxis
= infn_CustomerOneMember		        
Customer One [Member] | Sales Revenue, Net [Member] | Customer Concentration Risk [Member]                  
Significant Accounting Policies [Line Items]                  
Concentration risk 19.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueNetMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CustomerConcentrationRiskMember
/ us-gaap_MajorCustomersAxis
= infn_CustomerOneMember