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Operating Segments (Schedule Of Sales And Long-Lived Assets By Country) (Details) - USD ($)
$ in Thousands
12 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Mar. 31, 2014
Segment Reporting Information [Line Items]      
Sales and other operating revenues $ 2,120,373 $ 2,271,801 $ 2,542,115
Long-Lived Assets 424,958 404,535 395,999
United States [Member]      
Segment Reporting Information [Line Items]      
Sales and other operating revenues 275,147 290,950 304,527
Long-Lived Assets 84,072 70,929 61,347
Belgium [Member]      
Segment Reporting Information [Line Items]      
Sales and other operating revenues 371,580 336,396 289,206
Germany [Member]      
Segment Reporting Information [Line Items]      
Sales and other operating revenues 155,180 170,338 173,872
China [Member]      
Segment Reporting Information [Line Items]      
Sales and other operating revenues 135,032 174,872 210,956
NETHERLANDS      
Segment Reporting Information [Line Items]      
Sales and other operating revenues 121,767 113,297 208,031
Russia (Member)      
Segment Reporting Information [Line Items]      
Sales and other operating revenues 109,559 126,652 123,114
Brazil [Member]      
Segment Reporting Information [Line Items]      
Long-Lived Assets 133,727 135,980 135,359
Mozambique [Member]      
Segment Reporting Information [Line Items]      
Long-Lived Assets 53,069 55,733 49,543
All Other Countries [Member]      
Segment Reporting Information [Line Items]      
Sales and other operating revenues 952,108 1,059,296 1,232,409
Long-Lived Assets $ 154,090 $ 141,893 $ 149,750