Accumulated Other Comprehensive Income (Loss)	9 Months Ended
	Dec. 31, 2020
Disclosure Text Block [Abstract]
6. Comprehensive Income (Loss)	6. Accumulated Other Comprehensive Income (Loss) A summary of AOCI components, net of tax, were as follows:     Foreign Currency Translation   Unrealized Net Gain on Investments   Fair Market Value of Cash Flow Hedges   Postretirement Benefit Obligation Net Loss   Accumulated Other Comprehensive Income (Loss)     (Unaudited)     (In thousands) Balance as of March 31, 2020 $ (47,235) $ 90,684 $ (6,196) $ (2,601) $ 34,652 Foreign currency translation   (5,193)   -   -   -   (5,193) Unrealized net gain on investments   -   54,900   -   -   54,900 Change in fair value of cash flow hedges   -   -   (471)   -   (471) Amounts reclassified into earnings on hedging activities   -   -   2,022   -   2,022 Other comprehensive income (loss)   (5,193)   54,900   1,551   -   51,258 Balance as of December 31, 2020 $ (52,428) $ 145,584 $ (4,645) $ (2,601) $ 85,910