Income Taxes (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2019
Income Tax [Line Items]
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent	21.00%	21.00%	21.00%
Deferred tax liabilities on repatriated earnings	$ 0
Transfer pricing matter tax resolution additional tax expense	$ 0	$ 4,369	$ 2,169
Effective Income Tax Rate Reconciliation, Percent	23.40%	31.10%	27.20%
Effective Income Tax Rate Reconciliation, Tax Holiday, Amount			$ 7,800
Reversal of dividend withholding tax due to foreign subsidiary tax holiday	0.00%	0.00%	(5.10%)
Net operating loss carryforwards	$ 0
Unrecognized tax benefits that would impact effective tax rate	2,400
Liability where a significant change in unrecognized tax benefits is reasonably possible	100
Tax settlement	0	$ 8,948	$ 0
Interest expense	24,954	19,854	$ 17,510
Tax benefit - Hybrid Dividend
Income Tax [Line Items]
Tax settlement	4,400
Unresolved tax matter foreign jurisdiction
Income Tax [Line Items]
Interest expense	1,800
GILTI Tax Election
Income Tax [Line Items]
Tax settlement	$ 2,700
Transfer pricing issue [Member]
Income Tax [Line Items]
Transfer pricing matter tax resolution additional tax expense		$ 2,800
Effective Income Tax Rate Reconciliation, Percent		2.40%
Tax settlement		$ 8,900
Accrued Income Taxes		$ 4,500
Minimum [Member] | State And Foreign Jurisdictions [Member]
Income Tax [Line Items]
Open tax years	3
Maximum [Member] | State And Foreign Jurisdictions [Member]
Income Tax [Line Items]
Open tax years	6