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Operating Segments (Schedule Of Sales And Long-Lived Assets By Country) (Details) - USD ($)
$ in Thousands
12 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Mar. 31, 2015
Segment Reporting Information [Line Items]      
Sales and other operating revenues $ 2,071,218 $ 2,120,373 $ 2,271,801
Long-Lived Assets 416,228 424,958 404,535
United States [Member]      
Segment Reporting Information [Line Items]      
Sales and other operating revenues 320,731 275,147 290,950
Long-Lived Assets 85,145 84,072 70,929
Belgium [Member]      
Segment Reporting Information [Line Items]      
Sales and other operating revenues 320,735 371,580 336,396
Germany [Member]      
Segment Reporting Information [Line Items]      
Sales and other operating revenues 123,649 155,180 170,338
China [Member]      
Segment Reporting Information [Line Items]      
Sales and other operating revenues 137,855 135,032 174,872
NETHERLANDS      
Segment Reporting Information [Line Items]      
Sales and other operating revenues 91,266 121,767 113,297
Russia (Member)      
Segment Reporting Information [Line Items]      
Sales and other operating revenues 84,784 109,559 126,652
Brazil [Member]      
Segment Reporting Information [Line Items]      
Long-Lived Assets 134,074 133,727 135,980
Mozambique [Member]      
Segment Reporting Information [Line Items]      
Long-Lived Assets 50,311 53,069 55,733
All Other Countries [Member]      
Segment Reporting Information [Line Items]      
Sales and other operating revenues 992,198 952,108 1,059,296
Long-Lived Assets $ 146,698 $ 154,090 $ 141,893