Provision for Taxes (Reconciliation of total amounts of unrecognized tax benefits roll forward) (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Unrecognized tax benefits beginning balance	$ 29,632	$ 37,201
Revaluation based on change in after tax benefit	0	0
Additions based on tax positions related to the current year	1,479	42
Reductions for tax positions of prior years	(42)	(7,606)
Settlements	0	(5)
Unrecognized tax benefits ending balance	$ 31,069	$ 29,632