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Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)	12 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2017
Accumulated Other Comprehensive Income (Loss) [Abstract]
Beginning balance	$ 286,880,000	$ 257,637,000
Adjusted beginning balance	286,880,000
Other comprehensive (loss) income, net of tax	(713,000)	2,013,000
Amounts reclassified from other comprehensive loss, net of tax	0	0
Ending balance	279,755,000	286,880,000
ASU 2016-01 [Member]
Accumulated Other Comprehensive Income (Loss) [Abstract]
Cumulative-effect adjustment		0
Accumulated Other Comprehensive Income (Loss) [Member]
Accumulated Other Comprehensive Income (Loss) [Abstract]
Beginning balance	(5,428,000)	(7,441,000)
Adjusted beginning balance	(6,174,000)	(7,441,000)
Ending balance	(6,887,000)	(5,428,000)
Accumulated Other Comprehensive Income (Loss) [Member] | ASU 2016-01 [Member]
Accumulated Other Comprehensive Income (Loss) [Abstract]
Cumulative-effect adjustment		(746,000)	$ 0
Unrealized Gain on Short-Term Investments [Member]
Accumulated Other Comprehensive Income (Loss) [Abstract]
Beginning balance	746,000	528,000
Adjusted beginning balance	0	528,000
Other comprehensive (loss) income, net of tax	0	218,000
Amounts reclassified from other comprehensive loss, net of tax	0	0
Ending balance	0	746,000
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]
Beginning balance	(6,174,000)	(7,969,000)
Adjusted beginning balance	(6,174,000)	(7,969,000)
Other comprehensive (loss) income, net of tax	(713,000)	1,795,000
Amounts reclassified from other comprehensive loss, net of tax	0	0
Ending balance	$ (6,887,000)	(6,174,000)
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, before reclassification adjustments, of other comprehensive income (loss), attributable to parent.

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Amount of stockholders' equity (deficit), net of receivables from officers, directors, owners, and affiliates of the entity, attributable to both the parent and noncontrolling interests. Amount excludes temporary equity. Alternate caption for the concept is permanent equity.

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