Quarterly report pursuant to Section 13 or 15(d)

Business combinations - Pro Forma Results (Details)

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Business combinations - Pro Forma Results (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 6 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Mar. 31, 2021
Mar. 31, 2020
Business Combinations [Abstract]        
Revenue $ 994,751 $ 867,740 $ 1,996,377 $ 1,735,404
Net income $ 83,289 $ 28,013 $ 151,270 $ 82,530
Basic earnings per share (in dollars per share) $ 1.34 $ 0.44 $ 2.44 $ 1.28
Diluted earnings per share (in dollars per share) $ 1.34 $ 0.44 $ 2.43 $ 1.28