Accumulated Other Comprehensive Income (Loss)	3 Months Ended
	Jun. 30, 2023
Disclosure Text Block [Abstract]
6. 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 Loss     (Unaudited)     (In thousands) Balance as of March 31, 2023 $ (56,539) $   (232,740) $   4,007 $   (351) $   (285,623) Foreign currency translation   469   –   –   –   469 Unrealized net gains on investments   –   20,344   –   –   20,344 Change in fair value of cash flow hedges   –   –   3,842   –   3,842 Amounts reclassified into earnings on hedging activities   –   –   (868)   –   (868) Other comprehensive income (loss)   469   20,344   2,974   –   23,787 Balance as of June 30, 2023 $ ( 56,070 ) $   ( 212,396 ) $   6,981 $   ( 351 ) $   (261,836)