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Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)
 3 Months Ended 6 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Balance at beginning of period     $ 210,808,000  
Other comprehensive income (loss), net of tax $ (741,000) $ (1,477,000) (1,254,000) $ (1,832,000)
Amounts reclassified from accumulated other comprehensive loss, net of tax 0 0 0 0
Balance at end of period 228,824,000   228,824,000  
AOCI Attributable to Parent [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Balance at beginning of period (5,365,000) (2,873,000) (4,852,000) (2,518,000)
Balance at end of period (6,106,000) (4,350,000) (6,106,000) (4,350,000)
Unrealized Gain (Loss) on Short-Term Investments [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Balance at beginning of period 354,000 339,000 332,000 345,000
Other comprehensive income (loss), net of tax 66,000 (53,000) 88,000 (59,000)
Amounts reclassified from accumulated other comprehensive loss, net of tax 0 0 0 0
Balance at end of period 420,000 286,000 420,000 286,000
Foreign Currency Translation [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Balance at beginning of period (5,719,000) (3,212,000) (5,184,000) (2,863,000)
Other comprehensive income (loss), net of tax (807,000) (1,424,000) (1,342,000) (1,173,000)
Amounts reclassified from accumulated other comprehensive loss, net of tax 0 0 0 0
Balance at end of period $ (6,526,000) $ (4,636,000) $ (6,526,000) $ (4,636,000)