Annual report pursuant to Section 13 and 15(d)

Income taxes - Schedule of Components of Income From Continuing Operations before Income Taxes (Details)

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Income taxes - Schedule of Components of Income From Continuing Operations before Income Taxes (Details) - USD ($)
$ in Thousands
12 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2017
Income before income taxes:      
United States $ 280,092 $ 248,360 $ 257,910
Foreign 37,228 50,849 56,325
Income before income taxes $ 317,320 $ 299,209 $ 314,235