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Employee Benefit Plans (Net Periodic Benefit Cost, Defined Benefit Pension) (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2018
Share-based Payment Arrangement [Abstract]
Service costs	$ 11,008	$ 10,564	$ 9,715
Interest costs	1,055	1,301	1,126
Expected return on plan assets	(2,616)	(2,167)	(1,792)
Amortization:
Net prior service credit recognized	(435)	(443)	(51)
Net actuarial loss recognized	1,386	450	242
Settlement	(97)	(97)	0
Net periodic benefit cost	$ 10,301	$ 9,608	$ 9,240

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