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Pension and Other Benefit Plans (Narrative) (Details) - USD ($)
 12 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Mar. 31, 2021
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage 100.00%    
Total liabilities $ 864,658,000 $ 912,904,000  
Accrued liabilities 124,317,000 118,187,000  
Other non-current liabilities 192,013,000 192,610,000  
Charge recorded for contributions to defined contribution plans 5,808,000 4,540,000 $ 4,063,000
Fair value of plan assets at beginning of year 271,985,000    
Fair value of plan assets at end of year 231,667,000 271,985,000  
(Level 3)      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets at beginning of year 1,160,000    
Fair value of plan assets at end of year 0 1,160,000  
Pension Plans      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Accumulated Other Comprehensive Income (Loss), Gain (Loss), before Tax 17,169,000 29,230,000  
Defined Benefit Plan, Benefit Obligation 300,210,000 356,974,000 404,841,000
Curtailment charge 62,000 0 $ (19,038,000)
Employer contribution $ 4,796,000 $ 5,442,000  
Discount rate 4.82% 3.35% 2.62%
Net periodic pension cost (benefit) $ 1,964,000 $ (470,000) $ 22,104,000
Fair value of plan assets at beginning of year 271,985,000 286,678,000  
Fair value of plan assets at end of year 231,667,000 271,985,000 $ 286,678,000
Derecognized Assets, Securitized or Asset-backed Financing Arrangement Assets and any Other Financial Assets Managed Together [Line Items]      
Defined Benefit Plan, Pension Plan with Projected Benefit Obligation in Excess of Plan Assets, Plan Assets $ 101,826,000 121,110,000  
Investment Holdings [Line Items]      
Defined Benefit Plan, Plan Assets, Increase (Decrease) for Assets Transferred to (from) Plan   2,176,000  
Postretirement Benefit Plans      
Defined Benefit Plan Disclosure [Line Items]      
Retirement age 65 years    
Percentage of premium contributed 100.00%    
Net periodic pension cost (benefit) $ 158,000    
Postretirement Benefit Plans | American Association of Retired Persons      
Defined Benefit Plan Disclosure [Line Items]      
Employer contribution 35    
Defined Benefit Postretirement Life Insurance      
Defined Benefit Plan Disclosure [Line Items]      
Net periodic pension cost (benefit) 124,000    
Accrued liabilities 4,356,000    
Other non-current liabilities 136,000    
Cash Surrender Value of Life Insurance $ 3,690,000 $ 3,590,000