Accumulated Other Comprehensive Income (Loss)	9 Months Ended
	Dec. 31, 2022
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 Gains (Losses) 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, 2022 $ (55,757) $   105,027 $   (444) $   (2,442) $   46,384 Foreign currency translation   (757)   –   –   –   (757) Unrealized net loss on investments   –   (336,376)   –   –   (336,376) Change in fair value of cash flow hedges   –   –   6,532   –   6,532 Amounts reclassified into earnings on hedging activities   –   –   101   –   101 Other comprehensive income (loss)   (757)   (336,376)   6,633   –   (330,500) Balance as of December 31, 2022 $ ( 56,514 ) $   ( 231,349 ) $   6,189 $   ( 2,442 ) $   (284,116)