CONSOLIDATING GUARANTOR AND NON-GUARANTOR FINANCIAL INFORMATION (Details) - Summary of consolidated statement of operations and comprehensive income - USD ($) $ 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, 2016	Sep. 30, 2015	Sep. 30, 2014
Condensed Income Statements, Captions [Line Items]
Revenue	$ 500,705	$ 462,200	$ 500,107	$ 494,149	$ 502,158	$ 511,694	$ 500,020	$ 502,160	$ 1,957,161	$ 2,016,032	$ 1,991,811
Cost of goods and services									1,483,727	1,540,254	1,532,412
Gross profit	123,815	119,357	114,157	116,105	119,925	123,489	114,375	117,989	473,434	475,778	459,399
Selling, general and administrative expenses									364,027	374,761	375,099
Restructuring and other related charges									5,900	0	6,136
Total operating expenses									369,927	374,761	381,235
Income from operations									103,507	101,017	78,164
Other income (expense)
Interest income (expense), net									(51,111)	(47,872)	(48,144)
Loss from debt extinguishment									0	0	(38,890)
Other, net									768	491	3,154
Total other income (expense)									(50,343)	(47,381)	(83,880)
Income (loss) before taxes									53,164	53,636	(5,716)
Provision (benefit) for income taxes									23,154	19,347	(5,539)
Income (loss) before equity in net income of subsidiaries									30,010	34,289	(177)
Equity in net income (loss) of subsidiaries									0	0	0
Net income (loss)	$ 7,723	$ 7,596	$ 6,095	$ 8,596	$ 10,803	$ 10,893	$ 5,122	$ 7,471	30,010	34,289	(177)
Other comprehensive income (loss), net of taxes									9,947	(61,124)	(26,725)
Comprehensive income (loss)									39,957	(26,835)	(26,902)
Parent Company [Member]
Condensed Income Statements, Captions [Line Items]
Revenue									0	0	0
Cost of goods and services									0	0	0
Gross profit									0	0	0
Selling, general and administrative expenses									26,427	22,637	24,084
Restructuring and other related charges									0	0	0
Total operating expenses									26,427	22,637	24,084
Income from operations									(26,427)	(22,637)	(24,084)
Other income (expense)
Interest income (expense), net									(12,549)	(8,741)	(10,079)
Loss from debt extinguishment											(38,890)
Other, net									337	438	111
Total other income (expense)									(12,212)	(8,303)	(48,858)
Income (loss) before taxes									(38,639)	(30,940)	(72,942)
Provision (benefit) for income taxes									(16,333)	(11,041)	(32,044)
Income (loss) before equity in net income of subsidiaries									(22,306)	(19,899)	(40,898)
Equity in net income (loss) of subsidiaries									52,316	54,188	40,721
Net income (loss)									30,010	34,289	(177)
Comprehensive income (loss)									39,957	(26,835)	(26,902)
Guarantor Subsidiaries [Member]
Condensed Income Statements, Captions [Line Items]
Revenue									1,560,535	1,581,295	1,526,678
Cost of goods and services									1,173,928	1,204,872	1,156,268
Gross profit									386,607	376,423	370,410
Selling, general and administrative expenses									263,357	272,421	281,930
Restructuring and other related charges									1,299	0	4,234
Total operating expenses									264,656	272,421	286,164
Income from operations									121,951	104,002	84,246
Other income (expense)
Interest income (expense), net									(34,588)	(30,547)	(28,630)
Other, net									3,471	10,521	7,945
Total other income (expense)									(31,117)	(20,026)	(20,685)
Income (loss) before taxes									90,834	83,976	63,561
Provision (benefit) for income taxes									34,535	31,100	26,480
Income (loss) before equity in net income of subsidiaries									56,299	52,876	37,081
Equity in net income (loss) of subsidiaries									(5,728)	3,062	3,531
Net income (loss)									50,571	55,938	40,612
Comprehensive income (loss)									44,265	34,318	28,355
Non-Guarantor Subsidiaries [Member]
Condensed Income Statements, Captions [Line Items]
Revenue									425,182	475,380	519,349
Cost of goods and services									339,934	377,348	424,568
Gross profit									85,248	98,032	94,781
Selling, general and administrative expenses									74,613	80,073	75,551
Restructuring and other related charges									4,601	0	1,902
Total operating expenses									79,214	80,073	77,453
Income from operations									6,034	17,959	17,328
Other income (expense)
Interest income (expense), net									(3,974)	(8,584)	(9,435)
Other, net									(1,091)	(8,775)	(4,228)
Total other income (expense)									(5,065)	(17,359)	(13,663)
Income (loss) before taxes									969	600	3,665
Provision (benefit) for income taxes									4,952	(712)	25
Income (loss) before equity in net income of subsidiaries									(3,983)	1,312	3,640
Equity in net income (loss) of subsidiaries									56,299	52,876	37,081
Net income (loss)									52,316	54,188	40,721
Comprehensive income (loss)									68,970	15,080	25,704
Consolidation, Eliminations [Member]
Condensed Income Statements, Captions [Line Items]
Revenue									(28,556)	(40,643)	(54,216)
Cost of goods and services									(30,135)	(41,966)	(48,424)
Gross profit									1,579	1,323	(5,792)
Selling, general and administrative expenses									(370)	(370)	(6,466)
Restructuring and other related charges									0	0	0
Total operating expenses									(370)	(370)	(6,466)
Income from operations									1,949	1,693	674
Other income (expense)
Interest income (expense), net									0	0	0
Other, net									(1,949)	(1,693)	(674)
Total other income (expense)									(1,949)	(1,693)	(674)
Income (loss) before taxes									0	0	0
Provision (benefit) for income taxes									0	0	0
Income (loss) before equity in net income of subsidiaries									0	0	0
Equity in net income (loss) of subsidiaries									(102,887)	(110,126)	(81,333)
Net income (loss)									(102,887)	(110,126)	(81,333)
Comprehensive income (loss)									$ (113,235)	$ (49,398)	$ (54,059)