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Consolidated Statements of Comprehensive Income - USD ($)
 12 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Mar. 31, 2016
Consolidated Statements of Comprehensive Income [Abstract]      
Net income $ 16,316,000 $ 37,573,000 $ 10,563,000
Other comprehensive income (loss), net of tax:      
Unrealized gain (loss) on short-term investments (net of tax of $118,000, $111,000, and $(8,000), respectively) 218,000 196,000 (13,000)
Foreign currency translation gain (loss) 1,795,000 (2,785,000) (2,321,000)
Total other comprehensive income (loss), net of tax 2,013,000 (2,589,000) (2,334,000)
Comprehensive income $ 18,329,000 $ 34,984,000 $ 8,229,000