QUARTERLY FINANCIAL INFORMATION (UNAUDITED) (Details) - Schedule of quarterly financial information - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2015
Quarterly Financial Information Disclosure [Abstract]
Revenue	$ 430,799	$ 358,114	$ 383,807	$ 352,277	$ 374,365	$ 347,327	$ 385,108	$ 370,235	$ 1,524,997	$ 1,477,035	$ 1,483,291
Gross Profit	114,520	98,870	97,981	96,745	104,311	102,267	95,661	98,454	408,116	400,693	392,347
Net Income (loss)	$ (11,950)	$ 9,553	$ 5,045	$ 12,264	$ 5,531	$ 7,596	$ 6,095	$ 10,788	$ 14,912	$ 30,010	$ 34,289
Per Share - Basic (in Dollars per share)	$ (0.29)	$ 0.23	$ 0.12	$ 0.31	$ 0.14	$ 0.19	$ 0.15	$ 0.26	$ 0.36	$ 0.73	$ 0.77
Per Share - Diluted (in usd per share)	$ (0.28)	$ 0.22	$ 0.12	$ 0.29	$ 0.13	$ 0.18	$ 0.14	$ 0.24	$ 0.35	$ 0.68	$ 0.73