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Stockholders' Equity - Summary of Options Outstanding (Detail) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 12 Months Ended
Dec. 27, 2014
Dec. 28, 2013
Dec. 29, 2012
Dec. 31, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Options Outstanding, Number of Shares 4,298us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfOutstandingOptions      
Options Outstanding, Weighted-Average Remaining Contractual Life 3 years 11 months 9 days      
Options Outstanding, Weighted-Average Exercise Price $ 7.29us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice $ 7.26us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice $ 7.13us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice $ 7.03us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
Vested and Exercisable Options, Number of Shares 4,219infn_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExercisableNumber      
Vested and Exercisable Options, Weighted Average Exercise Price $ 7.28infn_ShareBasedCompensationArrangementByShareBasedPaymentsAwardOptionsVestedAndExercisableWeightedAverageExercisePrice      
$0.76 - $4.04 [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Exercise Price Lower Limit (in usd per share) $ 0.76infn_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingExercisePriceRangeLowerRangeLimit
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= infn_ExercisePricesRangeOneMember		      
Exercise Price Upper Limit (in usd per share) $ 4.04infn_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingAndExercisableExercisePriceRangeUpperRangeLimit
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= infn_ExercisePricesRangeOneMember		      
Options Outstanding, Number of Shares 754us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfOutstandingOptions
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= infn_ExercisePricesRangeOneMember		      
Options Outstanding, Weighted-Average Remaining Contractual Life 1 year 6 months 4 days      
Options Outstanding, Weighted-Average Exercise Price $ 2.06us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= infn_ExercisePricesRangeOneMember		      
Vested and Exercisable Options, Number of Shares 754infn_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExercisableNumber
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= infn_ExercisePricesRangeOneMember		      
Vested and Exercisable Options, Weighted Average Exercise Price $ 2.06infn_ShareBasedCompensationArrangementByShareBasedPaymentsAwardOptionsVestedAndExercisableWeightedAverageExercisePrice
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= infn_ExercisePricesRangeOneMember		      
$6.30 - $7.25 [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Exercise Price Lower Limit (in usd per share) $ 6.30infn_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingExercisePriceRangeLowerRangeLimit
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= infn_ExercisePricesRangeTwoMember		      
Exercise Price Upper Limit (in usd per share) $ 7.25infn_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingAndExercisableExercisePriceRangeUpperRangeLimit
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= infn_ExercisePricesRangeTwoMember		      
Options Outstanding, Number of Shares 536us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfOutstandingOptions
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= infn_ExercisePricesRangeTwoMember		      
Options Outstanding, Weighted-Average Remaining Contractual Life 5 years 3 months 15 days      
Options Outstanding, Weighted-Average Exercise Price $ 6.87us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= infn_ExercisePricesRangeTwoMember		      
Vested and Exercisable Options, Number of Shares 504infn_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExercisableNumber
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= infn_ExercisePricesRangeTwoMember		      
Vested and Exercisable Options, Weighted Average Exercise Price $ 6.88infn_ShareBasedCompensationArrangementByShareBasedPaymentsAwardOptionsVestedAndExercisableWeightedAverageExercisePrice
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= infn_ExercisePricesRangeTwoMember		      
$7.45 - $7.61 [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Exercise Price Lower Limit (in usd per share) $ 7.45infn_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingExercisePriceRangeLowerRangeLimit
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= infn_ExercisePriceRangeThreeMember		      
Exercise Price Upper Limit (in usd per share) $ 7.61infn_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingAndExercisableExercisePriceRangeUpperRangeLimit
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= infn_ExercisePriceRangeThreeMember		      
Options Outstanding, Number of Shares 706us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfOutstandingOptions
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= infn_ExercisePriceRangeThreeMember		      
Options Outstanding, Weighted-Average Remaining Contractual Life 3 years 8 months 19 days      
Options Outstanding, Weighted-Average Exercise Price $ 7.54us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= infn_ExercisePriceRangeThreeMember		      
Vested and Exercisable Options, Number of Shares 704infn_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExercisableNumber
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= infn_ExercisePriceRangeThreeMember		      
Vested and Exercisable Options, Weighted Average Exercise Price $ 7.54infn_ShareBasedCompensationArrangementByShareBasedPaymentsAwardOptionsVestedAndExercisableWeightedAverageExercisePrice
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= infn_ExercisePriceRangeThreeMember		      
$7.68 - $8.19 [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Exercise Price Lower Limit (in usd per share) $ 7.68infn_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingExercisePriceRangeLowerRangeLimit
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= infn_ExercisePricesRangeFourMember		      
Exercise Price Upper Limit (in usd per share) $ 8.19infn_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingAndExercisableExercisePriceRangeUpperRangeLimit
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= infn_ExercisePricesRangeFourMember		      
Options Outstanding, Number of Shares 1,069us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfOutstandingOptions
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= infn_ExercisePricesRangeFourMember		      
Options Outstanding, Weighted-Average Remaining Contractual Life 3 years 10 months 28 days      
Options Outstanding, Weighted-Average Exercise Price $ 8.12us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= infn_ExercisePricesRangeFourMember		      
Vested and Exercisable Options, Number of Shares 1,049infn_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExercisableNumber
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= infn_ExercisePricesRangeFourMember		      
Vested and Exercisable Options, Weighted Average Exercise Price $ 8.13infn_ShareBasedCompensationArrangementByShareBasedPaymentsAwardOptionsVestedAndExercisableWeightedAverageExercisePrice
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= infn_ExercisePricesRangeFourMember		      
$8.39 - $8.61 [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Exercise Price Lower Limit (in usd per share) $ 8.39infn_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingExercisePriceRangeLowerRangeLimit
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= infn_ExercisePriceRangeFiveMember		      
Exercise Price Upper Limit (in usd per share) $ 8.58infn_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingAndExercisableExercisePriceRangeUpperRangeLimit
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= infn_ExercisePriceRangeFiveMember		      
Options Outstanding, Number of Shares 627us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfOutstandingOptions
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= infn_ExercisePriceRangeFiveMember		      
Options Outstanding, Weighted-Average Remaining Contractual Life 6 years 4 days      
Options Outstanding, Weighted-Average Exercise Price $ 8.57us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= infn_ExercisePriceRangeFiveMember		      
Vested and Exercisable Options, Number of Shares 627infn_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExercisableNumber
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= infn_ExercisePriceRangeFiveMember		      
Vested and Exercisable Options, Weighted Average Exercise Price $ 8.57infn_ShareBasedCompensationArrangementByShareBasedPaymentsAwardOptionsVestedAndExercisableWeightedAverageExercisePrice
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= infn_ExercisePriceRangeFiveMember		      
$8.85 - $22.36 [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Exercise Price Lower Limit (in usd per share) $ 8.85infn_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingExercisePriceRangeLowerRangeLimit
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= infn_ExercisePriceRangeSixMember		      
Exercise Price Upper Limit (in usd per share) $ 22.36infn_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingAndExercisableExercisePriceRangeUpperRangeLimit
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= infn_ExercisePriceRangeSixMember		      
Options Outstanding, Number of Shares 606us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfOutstandingOptions
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= infn_ExercisePriceRangeSixMember		      
Options Outstanding, Weighted-Average Remaining Contractual Life 3 years 10 months 28 days      
Options Outstanding, Weighted-Average Exercise Price $ 11.05us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= infn_ExercisePriceRangeSixMember		      
Vested and Exercisable Options, Number of Shares 581infn_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExercisableNumber
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= infn_ExercisePriceRangeSixMember		      
Vested and Exercisable Options, Weighted Average Exercise Price $ 11.14infn_ShareBasedCompensationArrangementByShareBasedPaymentsAwardOptionsVestedAndExercisableWeightedAverageExercisePrice
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= infn_ExercisePriceRangeSixMember