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Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)
 12 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning balance $ 210,808,000 $ 190,203,000
Other comprehensive income (loss), net of tax (2,589,000) (2,334,000)
Amounts reclassified from other comprehensive income (loss), net of tax 0 0
Ending balance 248,681,000 210,808,000
AOCI Attributable to Parent [Member]    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning balance (4,852,000) (2,518,000)
Ending balance (7,441,000) (4,852,000)
Unrealized Gain (Loss) on Short-Term Investments [Member]    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning balance 332,000 345,000
Other comprehensive income (loss), net of tax 196,000 (13,000)
Amounts reclassified from other comprehensive income (loss), net of tax 0 0
Ending balance 528,000 332,000
Foreign Currency Translation [Member]    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning balance (5,184,000) (2,863,000)
Other comprehensive income (loss), net of tax (2,785,000) (2,321,000)
Amounts reclassified from other comprehensive income (loss), net of tax 0 0
Ending balance $ (7,969,000) $ (5,184,000)