Annual report pursuant to Section 13 and 15(d)

Business Combinations - Narrative (Details)

v3.21.2
Business Combinations - Narrative (Details)
$ in Thousands, ₩ in Millions, £ in Millions, $ in Millions
3 Months Ended 4 Months Ended 12 Months Ended
Sep. 30, 2021
USD ($)
Sep. 14, 2021
USD ($)
Sep. 14, 2021
GBP (£)
May 28, 2021
USD ($)
asset
Mar. 01, 2021
USD ($)
Aug. 21, 2020
USD ($)
Aug. 21, 2020
KRW (₩)
Feb. 28, 2020
USD ($)
Feb. 28, 2020
AUD ($)
Mar. 31, 2021
USD ($)
Sep. 30, 2021
USD ($)
Sep. 30, 2021
USD ($)
Sep. 30, 2020
USD ($)
Sep. 30, 2019
USD ($)
Aug. 21, 2020
KRW (₩)
Feb. 28, 2020
AUD ($)
Business Acquisition [Line Items]                                
Cash consideration paid, net of cash acquired                       $ 1,798,915 $ 7,066 $ 436,839    
Number of intangible assets acquired | asset       3                        
Amortization of intangible assets                       $ 44,357 35,634 33,054    
Estimated Straight-Line Useful Life                       10 years 9 months 18 days        
Revenue                       $ 4,254,485 3,461,537 2,886,815    
Gross profit                       946,975 711,002 671,184    
Acquisition related costs                       9,500        
Goodwill $ 1,774,406                   $ 1,774,406 1,774,406 $ 593,129 $ 584,469    
VES Group, Inc.                                
Business Acquisition [Line Items]                                
Percentage of voting equity interests acquired       100.00%                        
Cash consideration paid, net of cash acquired 1,360,231     $ 1,360,231                        
Liabilities arising from contingencies       12,000                        
Indemnification assets       6,000                        
Liability for uncertainty in income taxes       12,300                        
Revenue contributed from acquired business                     186,600          
Gross profit contributed from acquired business                     53,500          
Amortization of intangible assets                     18,400          
Estimated cash consideration, net of cash acquired 1,364,866     1,367,725                        
Acquisition related costs                       52,200        
Goodwill 864,176     857,274             864,176 864,176        
Intangible assets $ 664,000     664,000             $ 664,000 664,000        
VES Group, Inc. | Indemnification Asset On Uncertain Tax Positions                                
Business Acquisition [Line Items]                                
Indemnification assets       $ 7,200                        
Attain                                
Business Acquisition [Line Items]                                
Percentage of voting equity interests acquired         100.00%                      
Estimated cash consideration, net of cash acquired         $ 419,097                      
Revenue                       136,100        
Gross profit                       33,400        
Acquisition related costs                       $ 300        
Goodwill         304,026                      
Intangible assets         $ 105,000                      
Attain | Customer Relationships                                
Business Acquisition [Line Items]                                
Estimated Straight-Line Useful Life         10 years                      
Connect Assist                                
Business Acquisition [Line Items]                                
Percentage of voting equity interests acquired   100.00%                            
Cash payment to acquire business   $ 21,100 £ 15.5                          
Goodwill   11,100                            
Intangible assets   $ 7,700                            
Index Root                                
Business Acquisition [Line Items]                                
Percentage of voting equity interests acquired           100.00%                 100.00%  
Cash payment to acquire business           $ 5,400 ₩ 6,300                  
Contingent consideration           900                 ₩ 1,100  
Goodwill           5,100                    
Intangible assets           $ 1,400                    
Reversal of acquisition related costs                   $ 1,000            
InjuryNet                                
Business Acquisition [Line Items]                                
Percentage of voting equity interests acquired               100.00%               100.00%
Cash payment to acquire business               $ 4,400 $ 6.7              
Contingent consideration               2,100               $ 3.1
Goodwill               2,600                
Intangible assets               $ 900