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Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)	3 Months Ended		6 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 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	$ (2,000)	$ 668,000	(717,000)	$ 953,000
Amounts reclassified from accumulated other comprehensive loss, net of tax	0	0	0	0
Balance at end of period	282,164,000		282,164,000
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	(6,889,000)	(7,156,000)	(5,428,000)	(7,441,000)
Adjusted balance at beginning of period			(6,174,000)	(7,441,000)
Balance at end of period	(6,891,000)	(6,488,000)	(6,891,000)	(6,488,000)
Unrealized Gain on Short-Term Investments [Member]
Accumulated Other Comprehensive Income (Loss) [Abstract]
Balance at beginning of period	0	584,000	746,000	528,000
Adjusted balance at beginning of period			0	528,000
Other comprehensive (loss) income, net of tax	0	60,000	0	116,000
Amounts reclassified from accumulated other comprehensive loss, net of tax	0	0	0	0
Balance at end of period	0	644,000	0	644,000
Unrealized Gain 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	(6,889,000)	(7,740,000)	(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	(2,000)	608,000	(717,000)	837,000
Amounts reclassified from accumulated other comprehensive loss, net of tax	0	0	0	0
Balance at end of period	$ (6,891,000)	$ (7,132,000)	$ (6,891,000)	$ (7,132,000)
Foreign Currency Translation [Member] | ASU 2016-01 [Member]
Accumulated Other Comprehensive Income (Loss) [Abstract]
Cumulative-effect adjustment					$ 0	$ 0

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Amount after tax of reclassification adjustments of other comprehensive income (loss) attributable to parent.

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