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Employee Benefit Plans (Net Periodic Benefit Cost, Defined Benefit Pension) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Mar. 31, 2019
Share-based Payment Arrangement [Abstract]      
Service costs $ 12,121 $ 11,008 $ 10,564
Interest costs 1,047 1,055 1,301
Expected return on plan assets (2,535) (2,616) (2,167)
Amortization:      
Net prior service credit recognized (467) (435) (443)
Net actuarial loss recognized 2,144 1,386 450
Settlement 0 (97) (97)
Net periodic benefit cost $ 12,310 $ 10,301 $ 9,608