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Investments (Details 3) (USD $)
In Thousands, unless otherwise specified
Dec. 27, 2014
Mar. 29, 2014
Contractual Maturity of Investment Securities    
Due in less than one year, Amortized Cost $ 3,981us-gaap_AvailableForSaleSecuritiesDebtMaturitiesNextRollingTwelveMonthsAmortizedCostBasis $ 2,006us-gaap_AvailableForSaleSecuritiesDebtMaturitiesNextRollingTwelveMonthsAmortizedCostBasis
Due after one year through five years, Amortized Cost 2,842us-gaap_AvailableForSaleSecuritiesDebtMaturitiesRollingYearTwoThroughFiveAmortizedCostBasis 2,908us-gaap_AvailableForSaleSecuritiesDebtMaturitiesRollingYearTwoThroughFiveAmortizedCostBasis
Due after five years through ten years, Amortized Cost 2,532us-gaap_AvailableForSaleSecuritiesDebtMaturitiesRollingYearSixThroughTenAmortizedCostBasis 924us-gaap_AvailableForSaleSecuritiesDebtMaturitiesRollingYearSixThroughTenAmortizedCostBasis
Due after ten years, Amortized Cost 6,968us-gaap_AvailableForSaleSecuritiesDebtMaturitiesRollingAfterYearTenAmortizedCostBasis 7,707us-gaap_AvailableForSaleSecuritiesDebtMaturitiesRollingAfterYearTenAmortizedCostBasis
Total Amortized Cost 16,323us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis 13,545us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis
Due in less than one year, Fair Value 3,994us-gaap_AvailableForSaleSecuritiesDebtMaturitiesNextRollingTwelveMonthsFairValue 2,017us-gaap_AvailableForSaleSecuritiesDebtMaturitiesNextRollingTwelveMonthsFairValue
Due after one year through five years, Fair Value 2,849us-gaap_AvailableForSaleSecuritiesDebtMaturitiesRollingYearTwoThroughFiveFairValue 2,949us-gaap_AvailableForSaleSecuritiesDebtMaturitiesRollingYearTwoThroughFiveFairValue
Due after five years through ten years, Fair Value 2,517us-gaap_AvailableForSaleSecuritiesDebtMaturitiesRollingYearSixThroughTenFairValue 872us-gaap_AvailableForSaleSecuritiesDebtMaturitiesRollingYearSixThroughTenFairValue
Due after ten years, Fair Value 7,179us-gaap_AvailableForSaleSecuritiesDebtMaturitiesRollingAfterYearTenFairValue 7,692us-gaap_AvailableForSaleSecuritiesDebtMaturitiesRollingAfterYearTenFairValue
Total Fair Value - Available-for-sale Debt Securities $ 16,539us-gaap_AvailableForSaleSecuritiesDebtSecurities $ 13,530us-gaap_AvailableForSaleSecuritiesDebtSecurities