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Long-Term Debt (Details)
$ in Thousands
1 Months Ended 3 Months Ended 12 Months Ended
Dec. 15, 2016
USD ($)
Dec. 31, 2017
USD ($)
Nov. 30, 2019
USD ($)
May 31, 2019
USD ($)
Feb. 28, 2019
USD ($)
Nov. 30, 2018
USD ($)
Aug. 31, 2018
USD ($)
Aug. 31, 2019
USD ($)
Long-term debt                
Outstanding balance     $ 0         $ 0
Principal payment           $ 10,000    
New Credit Agreement                
Long-term debt                
Maximum borrowing capacity $ 150,000              
Additional borrowing capacity $ 50,000              
Carrying value of direct and indirect domestic subsidiaries     $ 242,578          
Applicable interest rate (as a percent)     0.00%          
Term of debt     5 years          
Amount drawn remained outstanding     $ 0         $ 0
Term of potential debt     7 years          
Amount drew in relation to acquisition   $ 65,000            
Principal payment       $ 6,000 $ 9,000 $ 10,000 $ 40,000  
New Credit Agreement | Minimum                
Long-term debt                
Consolidated fixed charge coverage ratio 1.25              
New Credit Agreement | Maximum                
Long-term debt                
Net leverage ratio 3.25              
New Credit Agreement | London Interbank Offered Rate (LIBOR)                
Long-term debt                
Interest payment due     3 months          
New Credit Agreement | London Interbank Offered Rate (LIBOR) | Minimum                
Long-term debt                
Interest rate margin on variable rate basis (as a percent)     1.00%          
New Credit Agreement | London Interbank Offered Rate (LIBOR) | Maximum                
Long-term debt                
Interest rate margin on variable rate basis (as a percent)     1.75%