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Employee Stock-Based Compensation (Stock Option Activity) (Details) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Mar. 31, 2022
Number of Shares      
Granted (in shares) 0   0
Stock options      
Number of Shares      
Options outstanding, beginning of period (in shares) 1,120,000 1,393,000 622,000
Granted (in shares)     842,000
Exercised (in shares) (181,000) (155,000) (71,000)
Forfeited (in shares) (176,000) (118,000)  
Options outstanding, end of period (in shares) 763,000 1,120,000 1,393,000
Vested and exercisable (in shares) 489,000    
Weighted-Average Exercise Price      
Beginning of period (in dollars per share) $ 66    
Exercised (in dollars per share) 43    
Forfeited (in dollars per share) 80    
End of period (in dollars per share) 68 $ 66  
Vested and exercisable (in dollars per share) $ 61    
Weighted-Average Remaining Contractual Term      
Outstanding, Weighted-Average Remaining Contractual Term (in years) 7 years 7 years 7 months 6 days  
Vested and exercisable, Weighted-Average Remaining Contractual Term (in years) 6 years 6 months    
Aggregate Intrinsic Value      
Exercised $ 6,160 $ 6,482 $ 5,573
Outstanding, March 31, 2024 16,243 $ 7,491  
Vested and exercisable, March 31, 2024 $ 13,960