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Acquisition - Purchase price allocation (Details) - USD ($)
$ in Thousands
Nov. 02, 2020
Feb. 28, 2021
Aug. 31, 2020
Business Acquisition [Line Items]      
Goodwill   $ 746,041 $ 709,703
Truvalue Labs, Inc.      
Business Acquisition [Line Items]      
Current assets $ 812    
Goodwill 30,058    
Other non-current assets 5,299    
Current liabilities (3,069)    
Other non-current liabilities (2,984)    
Total purchase price 41,916    
Truvalue Labs, Inc. | Software technology      
Business Acquisition [Line Items]      
Amortizable intangible assets $ 8,100    
Estimated acquisition date useful life 7 years    
Truvalue Labs, Inc. | Client relationships      
Business Acquisition [Line Items]      
Amortizable intangible assets $ 900    
Estimated acquisition date useful life 12 years    
Truvalue Labs, Inc. | Trade names      
Business Acquisition [Line Items]      
Amortizable intangible assets $ 2,800    
Estimated acquisition date useful life 15 years