Income Taxes (Schedule of Deferred Tax Assets and Liabilities) (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Mar. 31, 2018
Income Tax Disclosure [Abstract]
Foreign withholding taxes	$ 20,659	$ 25,987
Undistributed earnings	6,579	8,636
Goodwill	19,529	19,529
All other	7,088	9,039
Total deferred tax liabilities	53,855	63,191
Employee benefit plans	20,467	21,714
Reserves and accruals	7,898	9,673
Deferred income	3,829	4,878
Currency translation losses of foreign subsidiaries	1,993	1,993
Local currency exchange losses of foreign subsidiaries	1,252	843
All other	4,987	6,522
Total deferred tax assets	40,426	45,623
Valuation allowance	(1,798)	(1,040)
Net deferred tax assets	$ 38,628	$ 44,583