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Employee Benefit Plans (Net Periodic Benefit Cost, Defined Benefit Pension) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Mar. 31, 2020
Share-based Payment Arrangement [Abstract]      
Service costs $ 14,693 $ 12,121 $ 11,008
Interest costs 920 1,047 1,055
Expected return on plan assets (2,930) (2,535) (2,616)
Amortization:      
Net prior service credit recognized (465) (467) (435)
Net actuarial loss (gain) recognized (2,158) 2,144 1,386
Settlement 0 0 (97)
Net periodic benefit cost $ 10,060 $ 12,310 $ 10,301