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Comprehensive Income (Loss) (Accumulated other comprehensive income (loss) components of net of tax) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Accumulated Other Comprehensive Income (Loss) Components, Net of Tax [Roll Forward]        
Balance as of March 31, 2023     $ (285,623)  
Foreign currency translation $ (2,849) $ (739) (2,380) $ (542)
Unrealized net gain on investments (13,297) (108,444) 7,047 (244,826)
Change in fair value of cash flow hedges 3,333 6,289 7,175 6,417
Amount reclassified from AOCI (1,015) 19 (1,883) 446
Other comprehensive income (loss) (13,828) (102,875) 9,959 (238,505)
Balance as of September 30, 2023 (275,664)   (275,664)  
Foreign Currency Translation [Member]        
Accumulated Other Comprehensive Income (Loss) Components, Net of Tax [Roll Forward]        
Balance as of March 31, 2023     (56,539)  
Foreign currency translation     (2,380)  
Unrealized net gain on investments     0  
Change in fair value of cash flow hedges     0  
Amount reclassified from AOCI     0  
Other comprehensive income (loss)     (2,380)  
Balance as of September 30, 2023 (58,919)   (58,919)  
Unrealized Net Gain on Investments [Member]        
Accumulated Other Comprehensive Income (Loss) Components, Net of Tax [Roll Forward]        
Balance as of March 31, 2023     (232,740)  
Foreign currency translation     0  
Unrealized net gain on investments     7,047  
Change in fair value of cash flow hedges     0  
Amount reclassified from AOCI     0  
Other comprehensive income (loss)     7,047  
Balance as of September 30, 2023 (225,693)   (225,693)  
Fair Market Value of Cash Flow Hedges [Member]        
Accumulated Other Comprehensive Income (Loss) Components, Net of Tax [Roll Forward]        
Balance as of March 31, 2023     4,007  
Foreign currency translation     0  
Unrealized net gain on investments     0  
Change in fair value of cash flow hedges     7,175  
Amount reclassified from AOCI     (1,883)  
Other comprehensive income (loss)     5,292  
Balance as of September 30, 2023 9,299   9,299  
Postretirement Benefit Obligation Gain [Member]        
Accumulated Other Comprehensive Income (Loss) Components, Net of Tax [Roll Forward]        
Balance as of March 31, 2023     (351)  
Foreign currency translation     0  
Unrealized net gain on investments     0  
Change in fair value of cash flow hedges     0  
Amount reclassified from AOCI     0  
Other comprehensive income (loss)     0  
Balance as of September 30, 2023 (351)   (351)  
Accumulated Other Comprehensive Income (Loss) [Member]        
Accumulated Other Comprehensive Income (Loss) Components, Net of Tax [Roll Forward]        
Balance as of March 31, 2023     (285,623)  
Foreign currency translation (2,849) (739) (2,380) (542)
Unrealized net gain on investments (13,297) (108,444) 7,047 (244,826)
Change in fair value of cash flow hedges 3,333 6,289 7,175 6,417
Amount reclassified from AOCI (1,015) $ 19 (1,883) $ 446
Other comprehensive income (loss)     9,959  
Balance as of September 30, 2023 $ (275,664)   $ (275,664)