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Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)
 3 Months Ended 9 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Balance at beginning of period     $ 248,681,000  
Other comprehensive income (loss), net of tax $ 330,000 $ (1,242,000) 1,283,000 $ (2,496,000)
Amounts reclassified from accumulated other comprehensive loss, net of tax 0 0 0 0
Balance at end of period 268,533,000   268,533,000  
AOCI Attributable to Parent [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Balance at beginning of period (6,488,000) (6,106,000) (7,441,000) (4,852,000)
Balance at end of period (6,158,000) (7,348,000) (6,158,000) (7,348,000)
Unrealized Gain (Loss) on Short-Term Investments [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Balance at beginning of period 644,000 420,000 528,000 332,000
Other comprehensive income (loss), net of tax 83,000 10,000 199,000 98,000
Amounts reclassified from accumulated other comprehensive loss, net of tax 0 0 0 0
Balance at end of period 727,000 430,000 727,000 430,000
Foreign Currency Translation [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Balance at beginning of period (7,132,000) (6,526,000) (7,969,000) (5,184,000)
Other comprehensive income (loss), net of tax 247,000 (1,252,000) 1,084,000 (2,594,000)
Amounts reclassified from accumulated other comprehensive loss, net of tax 0 0 0 0
Balance at end of period $ (6,885,000) $ (7,778,000) $ (6,885,000) $ (7,778,000)