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Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)	3 Months Ended		9 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Mar. 31, 2018	Mar. 31, 2017
Accumulated Other Comprehensive Income (Loss) [Abstract]
Balance at beginning of period			$ 286,880,000
Other comprehensive (loss) income, net of tax	$ (302,000)	$ 330,000	(1,019,000)	$ 1,283,000
Amounts reclassified from accumulated other comprehensive loss, net of tax	0	0	0	0
Balance at end of period	279,788,000		279,788,000
ASU 2016-01 [Member]
Accumulated Other Comprehensive Income (Loss) [Abstract]
Cumulative-effect adjustment					$ (746,000)	$ 0
AOCI Attributable to Parent [Member]
Accumulated Other Comprehensive Income (Loss) [Abstract]
Balance at beginning of period	(6,891,000)	(6,488,000)	(5,428,000)	(7,441,000)
Adjusted balance at beginning of period			(6,174,000)	(7,441,000)
Balance at end of period	(7,193,000)	(6,158,000)	(7,193,000)	(6,158,000)
Unrealized Gain (Loss) on Short-Term Investments [Member]
Accumulated Other Comprehensive Income (Loss) [Abstract]
Balance at beginning of period	0	644,000	746,000	528,000
Adjusted balance at beginning of period			0	528,000
Other comprehensive (loss) income, net of tax	0	83,000	0	199,000
Amounts reclassified from accumulated other comprehensive loss, net of tax	0	0	0	0
Balance at end of period	0	727,000	0	727,000
Unrealized Gain (Loss) on Short-Term Investments [Member] | ASU 2016-01 [Member]
Accumulated Other Comprehensive Income (Loss) [Abstract]
Cumulative-effect adjustment					(746,000)	0
Foreign Currency Translation [Member]
Accumulated Other Comprehensive Income (Loss) [Abstract]
Balance at beginning of period	(6,891,000)	(7,132,000)	(6,174,000)	(7,969,000)
Adjusted balance at beginning of period			(6,174,000)	(7,969,000)
Other comprehensive (loss) income, net of tax	(302,000)	247,000	(1,019,000)	1,084,000
Amounts reclassified from accumulated other comprehensive loss, net of tax	0	0	0	0
Balance at end of period	$ (7,193,000)	$ (6,885,000)	$ (7,193,000)	$ (6,885,000)
Foreign Currency Translation [Member] | ASU 2016-01 [Member]
Accumulated Other Comprehensive Income (Loss) [Abstract]
Cumulative-effect adjustment					$ 0	$ 0

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