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Segment Operations - Financial Information for Reportable Segments (Detail) - USD ($)
$ in Thousands
3 Months Ended
Aug. 31, 2020
Aug. 31, 2019
May 31, 2020
Segment Reporting Information [Line Items]      
Net sales $ 702,909 $ 855,859  
Operating income (loss) (30,121) (14,588)  
Segment operating income (loss) 21,500 (9,342)  
Impairment of long-lived assets 9,924 40,601  
Restructuring and other expense, net 1,848 455  
Total assets 3,131,053   $ 2,331,515
Steel Processing      
Segment Reporting Information [Line Items]      
Net sales 431,020 523,375  
Operating income (loss) 13,617 6,168  
Restructuring and other expense, net 1,471 (26)  
Total assets 858,552   821,657
Pressure Cylinders      
Segment Reporting Information [Line Items]      
Net sales 270,904 304,396  
Operating income (loss) 8,642 29,623  
Impairment of long-lived assets 9,924    
Restructuring and other expense, net 314    
Total assets 1,046,605   1,104,603
Other      
Segment Reporting Information [Line Items]      
Net sales 985 28,088  
Operating income (loss) (759) (45,133)  
Impairment of long-lived assets   40,601  
Restructuring and other expense, net 63 481  
Total assets [1] 1,225,896   $ 405,255
Unallocated Corporate Other      
Segment Reporting Information [Line Items]      
Operating income (loss) (2,110) $ (5,246)  
Incremental Expenses Related To Nikola Gains      
Segment Reporting Information [Line Items]      
Operating income (loss) $ (49,511)    
[1] The material changes in total assets primarily relate to the Company’s investment in Nikola.  For additional information refer to “NOTE C – Investment in Nikola”.