Operating Segments (Schedule Of Sales And Long-Lived Assets By Country) (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Mar. 31, 2022
Segment Reporting Information [Line Items]
Sales and other operating revenues	$ 2,748,573	$ 2,569,824	$ 2,103,601
Long-Lived Assets	648,632	645,185	651,687
United States
Segment Reporting Information [Line Items]
Sales and other operating revenues	547,923	530,467	495,322
Long-Lived Assets	355,905	343,470	344,276
Belgium
Segment Reporting Information [Line Items]
Sales and other operating revenues	552,208	395,616	283,072
China
Segment Reporting Information [Line Items]
Sales and other operating revenues	219,979	204,139	97,826
Philippines
Segment Reporting Information [Line Items]
Sales and other operating revenues	133,656	149,867	147,876
Indonesia
Segment Reporting Information [Line Items]
Sales and other operating revenues	117,019	45,089	41,738
Poland
Segment Reporting Information [Line Items]
Sales and other operating revenues	97,723	119,629	90,270
Germany
Segment Reporting Information [Line Items]
Sales and other operating revenues	95,350	108,844	93,057
Netherlands
Segment Reporting Information [Line Items]
Sales and other operating revenues	42,492	51,843	45,297
Mexico
Segment Reporting Information [Line Items]
Sales and other operating revenues	26,438	51,847	29,514
France
Segment Reporting Information [Line Items]
Sales and other operating revenues	16,669	64,563	39,307
Brazil
Segment Reporting Information [Line Items]
Long-Lived Assets	139,642	134,232	136,653
Mozambique
Segment Reporting Information [Line Items]
Long-Lived Assets	35,845	38,979	40,228
All other countries
Segment Reporting Information [Line Items]
Sales and other operating revenues	899,116	847,920	740,322
Long-Lived Assets	$ 117,240	$ 128,504	$ 130,530