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Operating Segments (Schedule Of Sales And Long-Lived Assets By Country) (Details) - USD ($)
$ in Thousands
12 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Mar. 31, 2016
Segment Reporting Information [Line Items]      
Sales and other operating revenues $ 2,033,947 $ 2,071,218 $ 2,120,373
Long-Lived Assets 422,721 416,228 424,958
Belgium [Member]      
Segment Reporting Information [Line Items]      
Sales and other operating revenues 339,391 320,735 371,580
United States [Member]      
Segment Reporting Information [Line Items]      
Sales and other operating revenues 249,281 320,731 275,147
Long-Lived Assets 88,196 85,145 84,072
China [Member]      
Segment Reporting Information [Line Items]      
Sales and other operating revenues 120,859 137,855 135,032
Germany [Member]      
Segment Reporting Information [Line Items]      
Sales and other operating revenues 114,386 123,649 155,180
POLAND      
Segment Reporting Information [Line Items]      
Sales and other operating revenues 110,445 94,681 85,057
Russia (Member)      
Segment Reporting Information [Line Items]      
Sales and other operating revenues 49,619 84,784 109,559
NETHERLANDS      
Segment Reporting Information [Line Items]      
Sales and other operating revenues 45,698 91,266 121,767
Brazil [Member]      
Segment Reporting Information [Line Items]      
Long-Lived Assets 141,087 134,074 133,727
Mozambique [Member]      
Segment Reporting Information [Line Items]      
Long-Lived Assets 47,800 50,311 53,069
All Other Countries [Member]      
Segment Reporting Information [Line Items]      
Sales and other operating revenues 1,004,268 897,517 867,051
Long-Lived Assets $ 145,638 $ 146,698 $ 154,090