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Accumulated Other Comprehensive Loss (Details) - USD ($)	3 Months Ended		6 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Mar. 31, 2019	Mar. 31, 2018
Accumulated Other Comprehensive Income [Abstract]
Beginning balance	$ 274,829,000	$ 281,419,000	$ 279,755,000	$ 286,880,000
Adjusted beginning balance				286,880,000
Other comprehensive income (loss), net of tax	(431,000)	(2,000)	168,000	(717,000)
Amounts reclassified from accumulated other comprehensive income (loss), net of tax	0	0	0	0
Ending balance	281,345,000	282,164,000	281,345,000	282,164,000
ASU 2016-01 [Member]
Accumulated Other Comprehensive Income [Abstract]
Cumulative-effect adjustment					$ 0	$ 0
AOCI Attributable to Parent [Member]
Accumulated Other Comprehensive Income [Abstract]
Beginning balance	(6,288,000)	(6,889,000)	(6,887,000)	(5,428,000)
Adjusted beginning balance			(6,887,000)	(6,174,000)
Ending balance	(6,719,000)	(6,891,000)	(6,719,000)	(6,891,000)
AOCI Attributable to Parent [Member] | ASU 2016-01 [Member]
Accumulated Other Comprehensive Income [Abstract]
Cumulative-effect adjustment						(746,000)
Unrealized Gain on Short-Term Investments [Member]
Accumulated Other Comprehensive Income [Abstract]
Beginning balance	0	0	0	746,000
Adjusted beginning balance			0	0
Other comprehensive income (loss), net of tax	0	0	0	0
Amounts reclassified from accumulated other comprehensive income (loss), net of tax	0	0	0	0
Ending balance	0	0	0	0
Unrealized Gain on Short-Term Investments [Member] | ASU 2016-01 [Member]
Accumulated Other Comprehensive Income [Abstract]
Cumulative-effect adjustment					0	(746,000)
Foreign Currency Translation [Member]
Accumulated Other Comprehensive Income [Abstract]
Beginning balance	(6,288,000)	(6,889,000)	(6,887,000)	(6,174,000)
Adjusted beginning balance			(6,887,000)	(6,174,000)
Other comprehensive income (loss), net of tax	(431,000)	(2,000)	168,000	(717,000)
Amounts reclassified from accumulated other comprehensive income (loss), net of tax	0	0	0	0
Ending balance	$ (6,719,000)	$ (6,891,000)	$ (6,719,000)	$ (6,891,000)
Foreign Currency Translation [Member] | ASU 2016-01 [Member]
Accumulated Other Comprehensive Income [Abstract]
Cumulative-effect adjustment					$ 0	$ 0

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