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Business Combinations - Total Acquisition Consideration and Fair Value of Net Assets Acquired (Details) - USD ($)
$ in Thousands
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2018
Net assets acquired      
Goodwill $ 67,144 $ 52,758 $ 25,989
IBA      
Business Acquisition [Line Items]      
Preliminary purchase price for IBA 32,706    
Net assets acquired      
Cash and cash equivalents 28    
Accounts receivable 3,907    
Other current assets 124    
Total current assets 4,059    
Accounts payable and accrued expenses (758)    
Payroll liabilities (1,269)    
Other current liabilities (177)    
Net working capital 1,855    
Equipment and improvements, net 28    
Other long-term assets/liabilities 214    
Net identifiable assets acquired 2,097    
Goodwill 30,609    
Net assets acquired $ 32,706