Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)	3 Months Ended		6 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance at beginning of period	$ (2,873,000)	$ (822,000)	$ (2,518,000)	$ (877,000)
Other comprehensive (loss) income, net of tax	(1,477,000)	(516,000)	(1,832,000)	(461,000)
Amounts reclassified from accumulated other comprehensive loss, net of tax	0	0	0	0
Balance at end of period	(4,350,000)	(1,338,000)	(4,350,000)	(1,338,000)
Unrealized Gain (Loss) on Short-Term Investments [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance at beginning of period	339,000	331,000	345,000	321,000
Other comprehensive (loss) income, net of tax	(53,000)	(3,000)	(59,000)	7,000
Amounts reclassified from accumulated other comprehensive loss, net of tax	0	0	0	0
Balance at end of period	286,000	328,000	286,000	328,000
Foreign Currency Translation [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance at beginning of period	(3,212,000)	(1,153,000)	(2,863,000)	(1,198,000)
Other comprehensive (loss) income, net of tax	(1,424,000)	(513,000)	(1,773,000)	(468,000)
Amounts reclassified from accumulated other comprehensive loss, net of tax	0	0	0	0
Balance at end of period	$ (4,636,000)	$ (1,666,000)	$ (4,636,000)	$ (1,666,000)