Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)	3 Months Ended
	Jun. 30, 2016	Jun. 30, 2015
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance at beginning of period	$ 210,808,000
Other comprehensive income (loss), net of tax	(513,000)	$ (355,000)
Amounts reclassified from accumulated other comprehensive loss, net of tax	0	0
Balance at end of period	220,061,000
AOCI Attributable to Parent [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance at beginning of period	(4,852,000)	(2,518,000)
Balance at end of period	(5,365,000)	(2,873,000)
Unrealized Gain (Loss) on Short-Term Investments [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance at beginning of period	332,000	345,000
Other comprehensive income (loss), net of tax	22,000	(6,000)
Amounts reclassified from accumulated other comprehensive loss, net of tax	0	0
Balance at end of period	354,000	339,000
Foreign Currency Translation [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance at beginning of period	(5,184,000)	(2,863,000)
Other comprehensive income (loss), net of tax	(535,000)	(349,000)
Amounts reclassified from accumulated other comprehensive loss, net of tax	0	0
Balance at end of period	$ (5,719,000)	$ (3,212,000)