Consolidated Statements of Operations (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Income Statement [Abstract]
Net service revenues	$ 657,209	$ 630,330	$ 1,779,859	$ 1,771,800
Cost of services provided	468,589	454,753	1,313,284	1,311,441
Gross profit	188,620	175,577	466,575	460,359
Selling, general and administrative expense	113,964	119,246	343,519	356,840
Amortization expense	13,936	29,247	42,873	89,611
Income from operations	60,720	27,084	80,183	13,908
Other income	382	265	104	1,284
Interest expense	18,360	27,499	54,429	77,481
Income (loss) before income taxes	42,742	(150)	25,858	(62,289)
Income tax (expense) benefit	(11,033)	(1,247)	(6,582)	58,150
Net income (loss)	$ 31,709	$ (1,397)	$ 19,276	$ (4,139)
Income (loss) per share:
Basic and diluted	$ 0.31	$ (0.02)	$ 0.19	$ (0.05)