Marketable Securities (Continuous Unrealized Loss Position) (Details) (USD $) In Thousands, unless otherwise specified
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6 Months Ended |
Dec. 31, 2014 |
Investments in an Unrealized Loss Position |
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Fair Value |
$ 1,087,962us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue |
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Gross Unrealized Losses, less than 12 months |
(1,645)us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss |
[1] |
Continuous loss position not exceeding this period |
12 months |
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U.S. Treasury securities |
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Investments in an Unrealized Loss Position |
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Fair Value |
218,222us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USTreasurySecuritiesMember |
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Gross Unrealized Losses, less than 12 months |
(144)us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USTreasurySecuritiesMember |
[1] |
U.S. Government agency securities |
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Investments in an Unrealized Loss Position |
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Fair Value |
392,285us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USGovernmentAgenciesDebtSecuritiesMember |
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Gross Unrealized Losses, less than 12 months |
(552)us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USGovernmentAgenciesDebtSecuritiesMember |
[1] |
Municipal securities |
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Investments in an Unrealized Loss Position |
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Fair Value |
24,410us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_MunicipalBondsMember |
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Gross Unrealized Losses, less than 12 months |
(33)us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_MunicipalBondsMember |
[1] |
Corporate debt securities |
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Investments in an Unrealized Loss Position |
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Fair Value |
420,180us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CorporateDebtSecuritiesMember |
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Gross Unrealized Losses, less than 12 months |
(885)us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CorporateDebtSecuritiesMember |
[1] |
Sovereign securities |
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Investments in an Unrealized Loss Position |
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Fair Value |
32,865us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_SovereignDebtSecuritiesMember |
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Gross Unrealized Losses, less than 12 months |
$ (31)us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_SovereignDebtSecuritiesMember |
[1] |
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