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Cash, Cash Equivalents and Investments with Hierarchy (Details) - USD ($)
$ in Thousands
Jun. 30, 2015
Mar. 31, 2015
Jun. 30, 2014
Mar. 31, 2014
Amortized Costs $ 157,116 $ 177,198    
Gross Unrealized Gains 53 71    
Gross Unrealized Loss (203) (175)    
Estimated Fair Value 156,966 177,094    
Cash and cash equivalents 29,298 53,110 $ 55,073 $ 59,159
Short-term marketable investments 127,668 123,984    
Aavailable-for-sale investments due within one year 68,976      
Aavailable-for-sale investments due after one year 58,692      
Level 1        
Amortized Costs 31,298 55,110    
Gross Unrealized Gains 0 0    
Gross Unrealized Loss (139) (107)    
Estimated Fair Value 31,159 55,003    
Cash and cash equivalents 29,298 53,110    
Short-term marketable investments 1,861 1,893    
Level 2        
Amortized Costs 125,818 122,088    
Gross Unrealized Gains 53 71    
Gross Unrealized Loss (64) (68)    
Estimated Fair Value 125,807 122,091    
Cash and cash equivalents 0 0    
Short-term marketable investments 125,807 122,091    
Cash        
Amortized Costs 12,466 24,734    
Gross Unrealized Gains 0 0    
Gross Unrealized Loss 0 0    
Estimated Fair Value 12,466 24,734    
Cash and cash equivalents 12,466 24,734    
Short-term marketable investments 0 0    
Money Market Funds | Level 1        
Amortized Costs 16,832 28,376    
Gross Unrealized Gains 0 0    
Gross Unrealized Loss 0 0    
Estimated Fair Value 16,832 28,376    
Cash and cash equivalents 16,832 28,376    
Short-term marketable investments 0 0    
Mutual Funds | Level 1        
Amortized Costs 2,000 2,000    
Gross Unrealized Gains 0 0    
Gross Unrealized Loss (139) (107)    
Estimated Fair Value 1,861 1,893    
Cash and cash equivalents 0 0    
Short-term marketable investments 1,861 1,893    
Commercial Paper | Level 2        
Amortized Costs 9,783 9,043    
Gross Unrealized Gains 2 1    
Gross Unrealized Loss (1) 0    
Estimated Fair Value 9,784 9,044    
Cash and cash equivalents 0 0    
Short-term marketable investments 9,784 9,044    
Corporate Debt | Level 2        
Amortized Costs 72,828 75,284    
Gross Unrealized Gains 38 57    
Gross Unrealized Loss (29) (10)    
Estimated Fair Value 72,837 75,331    
Cash and cash equivalents 0 0    
Short-term marketable investments 72,837 75,331    
Municipal Securities | Level 2        
Amortized Costs 6,471 5,435    
Gross Unrealized Gains 2 2    
Gross Unrealized Loss (1) (1)    
Estimated Fair Value 6,472 5,436    
Cash and cash equivalents 0 0    
Short-term marketable investments 6,472 5,436    
Asset-backed Securities | Level 2        
Amortized Costs 23,427 21,503    
Gross Unrealized Gains 5 4    
Gross Unrealized Loss (8) (5)    
Estimated Fair Value 23,424 21,502    
Cash and cash equivalents 0 0    
Short-term marketable investments 23,424 21,502    
Mortgage backed Securities | Level 2        
Amortized Costs 5,000 5,822    
Gross Unrealized Gains 1 0    
Gross Unrealized Loss (23) (52)    
Estimated Fair Value 4,978 5,770    
Cash and cash equivalents 0 0    
Short-term marketable investments 4,978 5,770    
Agency Bond | Level 2        
Amortized Costs 7,509 4,201    
Gross Unrealized Gains 2 3    
Gross Unrealized Loss (2) 0    
Estimated Fair Value 7,509 4,204    
Cash and cash equivalents 0 0    
Short-term marketable investments 7,509 4,204    
International Government Securities | Level 2        
Amortized Costs 800 800    
Gross Unrealized Gains 3 4    
Gross Unrealized Loss 0 0    
Estimated Fair Value 803 804    
Cash and cash equivalents 0 0    
Short-term marketable investments $ 803 $ 804