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CONSOLIDATED STATEMENTS OF INCOME (PARENTHETICAL) - USD ($)
$ in Thousands
12 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2016
Income Statement [Abstract]      
Income tax expense $ 0 $ 6,841 $ 3,731
Gain on sale of discontinued operations, tax $ 0 $ 10,215 $ 0