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Goodwill and Intangible Assets - Narrative (Details) - USD ($)
$ in Thousands
1 Months Ended 3 Months Ended 12 Months Ended
Feb. 29, 2020
Feb. 29, 2020
Feb. 29, 2020
Feb. 28, 2019
Feb. 28, 2018
Finite-Lived Intangible Assets [Line Items]          
Document Period End Date     Feb. 29, 2020    
Gain (Loss) on Disposition of Business   $ (18,600) $ (18,632) $ 0 $ 0
Goodwill, Written off Related to Sale of Business Unit     7,888    
Amortization of intangible assets     17,100 17,000 $ 17,100
Finite-Lived Intangible Assets, Net $ 98,474 98,474 98,474 $ 121,976  
Nuclear Logistics Business [Member]          
Finite-Lived Intangible Assets [Line Items]          
Gain (Loss) on Disposition of Business (18,600)        
Impairment of Intangible Assets, Finite-lived     14,600    
Finite-Lived Intangible Assets, Net $ 7,200 $ 7,200 $ 7,200