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Consolidated Statements of Comprehensive Income (Unaudited) (Parenthetical) - USD ($)
3 Months Ended 9 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Other comprehensive income (loss), net of tax:        
Unrealized gain (loss) on short-term investments, tax $ 7,000 $ 29,000 $ 66,000 $ (11,000)