Annual report pursuant to Section 13 and 15(d)

Business Combinations - Goodwill (Details)

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Business Combinations - Goodwill (Details) - USD ($)
$ in Thousands
3 Months Ended
Dec. 31, 2018
Dec. 31, 2019
Measurement period adjustment to goodwill $ 1,000  
Goodwill $ 1,364,016 $ 1,367,918
2018 Acquisitions    
Goodwill   287,009
Goodwill expected to be deducted for income tax purposes   $ 32,800