v2.4.1.9
Marketable Securities (Additional Information) (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 28, 2015
Held To Maturity Securities Continuous Unrealized Loss Position Percentage 43.00%grmn_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionPercentage
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value, Total $ 952,364us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue
Available For Sale Securities Continuous Unrealized Loss Position Amortization Cost $ 962,449grmn_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAmortizationCost