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Consolidated Statements of Comprehensive Income - USD ($)
 12 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Mar. 31, 2014
Consolidated Statements of Comprehensive Income [Abstract]      
Net income $ 10,563,000 $ 11,453,000 $ 107,359,000
Other comprehensive income (loss), net of tax:      
Unrealized (loss) gain on short-term investments (net of tax of $(8,000), $16,000, and $22,000, respectively) (13,000) 24,000 34,000
Foreign currency translation loss (2,321,000) (1,665,000) (65,000)
Total other comprehensive loss, net of tax (2,334,000) (1,641,000) (31,000)
Comprehensive income $ 8,229,000 $ 9,812,000 $ 107,328,000