QUARTERLY FINANCIAL INFORMATION (UNAUDITED) (Details) - Schedule of quarterly financial information - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2016
Quarterly Financial Information Disclosure [Abstract]
Revenue	$ 545,505	$ 516,550	$ 478,560	$ 437,303	$ 430,799	$ 358,114	$ 383,807	$ 352,277	$ 1,977,918	$ 1,524,997	$ 1,477,035
Gross Profit	148,451	138,792	121,473	120,844	114,519	97,984	98,869	96,744	529,560	408,116	400,693
Income from continuing operations	$ 1,031	$ 7,442	$ 1,951	$ 22,831	$ 4,337	$ 4,452	$ 1,950	$ 7,044	$ 33,255	$ 17,783	$ 19,781
Per Share - Basic (in usd per share)	$ 0.03	$ 0.18	$ 0.05	$ 0.54	$ 0.10	$ 0.11	$ 0.05	$ 0.18	$ 0.81	$ 0.43	$ 0.48
Per Share - Diluted (in usd per share)	$ 0.02	$ 0.18	$ 0.05	$ 0.53	$ 0.10	$ 0.10	$ 0.05	$ 0.17	$ 0.78	$ 0.41	$ 0.45