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Certain Financial Statement Information Interest Income/Expense (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 9 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2014
Dec. 31, 2013
Schedule of Interest Income, Net        
Interest income $ 362us-gaap_InvestmentIncomeInterest $ 519us-gaap_InvestmentIncomeInterest $ 1,091us-gaap_InvestmentIncomeInterest $ 1,389us-gaap_InvestmentIncomeInterest
Net realized gain on short-term investments 123us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax 6us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax 123us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax 3,290us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax
Interest income, net $ 485us-gaap_InvestmentIncomeNonoperating $ 525us-gaap_InvestmentIncomeNonoperating $ 1,214us-gaap_InvestmentIncomeNonoperating $ 4,679us-gaap_InvestmentIncomeNonoperating