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Condensed Consolidated Statements of Comprehensive Income (Loss) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2015	Mar. 31, 2014
Statement Of Income And Comprehensive Income [Abstract]
Net income/(loss)	$ 31,478us-gaap_NetIncomeLoss	$ (40,056)us-gaap_NetIncomeLoss	$ 79,041us-gaap_NetIncomeLoss	$ 12,217us-gaap_NetIncomeLoss
Other comprehensive income:
Change in unrealized net gain on investments	347us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	306us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	561us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	1,597us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax
Reclassification from accumulated other comprehensive income to interest income for accretion of non-current investments	(377)us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax	(278)us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax	(1,046)us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax	(751)us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax
Net current-period other comprehensive income/(loss)	(30)us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	28us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	(485)us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	846us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent
Comprehensive income/(loss)	$ 31,448us-gaap_ComprehensiveIncomeNetOfTax	$ (40,028)us-gaap_ComprehensiveIncomeNetOfTax	$ 78,556us-gaap_ComprehensiveIncomeNetOfTax	$ 13,063us-gaap_ComprehensiveIncomeNetOfTax

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Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income, attributable to parent entity. Excludes changes in equity resulting from investments by owners and distributions to owners.

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