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Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)
 3 Months Ended 9 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Balance at beginning of period     $ 210,808,000  
Other comprehensive income (loss), net of tax $ (1,242,000) $ (380,000) (2,496,000) $ (2,212,000)
Amounts reclassified from accumulated other comprehensive loss, net of tax 0 0 0 0
Balance at end of period 239,936,000   239,936,000  
AOCI Attributable to Parent [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Balance at beginning of period (6,106,000) (4,350,000) (4,852,000) (2,518,000)
Balance at end of period (7,348,000) (4,730,000) (7,348,000) (4,730,000)
Unrealized Gain (Loss) on Short-Term Investments [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Balance at beginning of period 420,000 286,000 332,000 345,000
Other comprehensive income (loss), net of tax 10,000 42,000 98,000 (17,000)
Amounts reclassified from accumulated other comprehensive loss, net of tax 0 0 0 0
Balance at end of period 430,000 328,000 430,000 328,000
Foreign Currency Translation [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Balance at beginning of period (6,526,000) (4,636,000) (5,184,000) (2,863,000)
Other comprehensive income (loss), net of tax (1,252,000) (422,000) (2,594,000) (2,195,000)
Amounts reclassified from accumulated other comprehensive loss, net of tax 0 0 0 0
Balance at end of period $ (7,778,000) $ (5,058,000) $ (7,778,000) $ (5,058,000)