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Fair Value Measurements (Narrative) (Details) - USD ($)
 12 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Mar. 31, 2022
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Equity method investment $ 18,000,000 $ 20,500,000  
Impairment of equity method investments 0 21,400,000 $ 0
Initial cost basis of securities 10,100,000 12,600,000  
Equity securities without readily determinable fair value, upward price adjustment, annual amount   6,900,000  
Financial asset impairment charges 0 0 0
Impairment loss, before tax 9,600,000    
Impairment of intangible assets 3,526,000 0 7,000,000
Non-financial asset impairment charges   0  
Discontinued operations      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Impairment of intangible assets     $ 7,000,000
Level 1 | Recurring      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Investments for deferred compensation plan $ 29,174,000 $ 28,213,000