Consolidated Statements of Operations (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2019	Mar. 31, 2018
Income Statement [Abstract]
Net service revenues	$ 596,637	$ 590,382	$ 1,122,650	$ 1,141,471
Cost of services provided	450,569	448,149	844,694	856,688
Gross profit	146,068	142,233	277,956	284,783
Selling, general and administrative expense	119,413	117,817	229,555	237,592
Amortization expense	13,807	29,318	28,938	60,364
Income (loss) from operations	12,848	(4,902)	19,463	(13,173)
Other income (expense)	1,176	49	(278)	1,018
Interest expense	18,945	25,069	36,069	49,982
Loss before income taxes	(4,921)	(29,922)	(16,884)	(62,137)
Income tax benefit	1,315	7,858	4,451	59,397
Net loss	$ (3,606)	$ (22,064)	$ (12,433)	$ (2,740)
Loss per share:
Basic and diluted	$ (0.04)	$ (0.29)	$ (0.12)	$ (0.04)