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Balance Sheet Components (Schedule Of Other Accrued Liabilities) (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Balance Sheet Related Disclosures [Abstract]    
Sales and marketing programs $ 54,582us-gaap_AccruedMarketingCostsCurrent $ 47,941us-gaap_AccruedMarketingCostsCurrent
Warranty obligation 44,888us-gaap_ProductWarrantyAccrualClassifiedCurrent 48,754us-gaap_ProductWarrantyAccrualClassifiedCurrent
Freight 6,827ntgr_AccruedFreightCharges 5,790ntgr_AccruedFreightCharges
Other 37,445us-gaap_OtherAccruedLiabilitiesCurrent 40,733us-gaap_OtherAccruedLiabilitiesCurrent
Total other accrued liabilities $ 143,742us-gaap_AccruedLiabilitiesCurrent $ 143,218us-gaap_AccruedLiabilitiesCurrent