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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
Feb. 29, 2020
Nov. 30, 2019
May 31, 2021
May 31, 2020
May 31, 2019
Business Acquisition [Line Items]          
Goodwill     $ 351,056 $ 321,434 $ 334,607
Heidtman Cleveland          
Business Acquisition [Line Items]          
Property, plant, and equipment $ 6,104        
Finance lease assets 11,940        
Other assets 725        
Net identifiable assets 21,569        
Goodwill 8,024        
Purchase price 29,593        
Heidtman Cleveland | Preliminary Valuation          
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 Cleveland | Measurement Period Adjustments          
Business Acquisition [Line Items]          
Property, plant, and equipment (1,411)        
Finance lease assets 3,940        
Net identifiable assets 2,429        
Goodwill (2,429)        
Heidtman Cleveland | Customer Lists          
Business Acquisition [Line Items]          
Intangible assets 2,800        
Heidtman Cleveland | Customer Lists | Preliminary Valuation          
Business Acquisition [Line Items]          
Intangible assets   $ 2,900      
Heidtman Cleveland | Customer Lists | Measurement Period Adjustments          
Business Acquisition [Line Items]          
Intangible assets $ (100)