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Stockholders' Equity - Summary of Effects of Stock Based Compensation on Company's Balance Sheets (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 27, 2014
Dec. 28, 2013
Dec. 29, 2012
Stock-based compensation effects in inventory [Member]      
Effects Of Stock Based Compensation [Line Items]      
Effects of stock based compensation $ 3,088infn_EffectsOfStockBasedCompensation
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_InventoryValuationAndObsolescenceMember		 $ 3,189infn_EffectsOfStockBasedCompensation
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_InventoryValuationAndObsolescenceMember		 $ 4,891infn_EffectsOfStockBasedCompensation
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_InventoryValuationAndObsolescenceMember
Stock-based compensation effects in deferred inventory cost [Member]      
Effects Of Stock Based Compensation [Line Items]      
Effects of stock based compensation 13infn_EffectsOfStockBasedCompensation
/ us-gaap_BalanceSheetLocationAxis
= infn_DeferredInventoryCostMember		 15infn_EffectsOfStockBasedCompensation
/ us-gaap_BalanceSheetLocationAxis
= infn_DeferredInventoryCostMember		 42infn_EffectsOfStockBasedCompensation
/ us-gaap_BalanceSheetLocationAxis
= infn_DeferredInventoryCostMember
Stock-based compensation effects in fixed assets [Member]      
Effects Of Stock Based Compensation [Line Items]      
Effects of stock based compensation $ 119infn_EffectsOfStockBasedCompensation
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_AssetsMember		 $ 145infn_EffectsOfStockBasedCompensation
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_AssetsMember		 $ 146infn_EffectsOfStockBasedCompensation
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_AssetsMember