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Acquisitions - Schedule of Consideration Paid and the Fair Value Assigned to the Assets Acquired And Liabilities Assumed (Details) - USD ($)
$ in Thousands
Oct. 07, 2019
Nov. 30, 2019
May 31, 2019
Business Acquisition [Line Items]      
Goodwill   $ 341,850 $ 334,607
Heidtman Steel Products, Inc.      
Business Acquisition [Line Items]      
Property, plant and equipment $ 7,515    
Finance lease assets 8,000    
Other assets 725    
Net identifiable assets 19,140    
Goodwill 10,453    
Purchase price 29,593    
Heidtman Steel Products, Inc. | Customer Lists [Member]      
Business Acquisition [Line Items]      
Intangible assets $ 2,900