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, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2013
Condensed Income Statements, Captions [Line Items]
Revenue	$ 502,158	$ 511,694	$ 500,020	$ 502,160	$ 525,627	$ 505,039	$ 507,687	$ 453,458	$ 2,016,032	$ 1,991,811	$ 1,871,327
Cost of goods and services									1,540,254	1,532,412	1,453,742
Gross profit	119,925	123,489	114,375	117,989	125,602	118,307	109,987	105,503	475,778	459,399	417,585
Selling, general and administrative expenses									374,761	375,099	340,469
Restructuring and other related charges									0	6,136	13,262
Total operating expenses									374,761	381,235	353,731
Income from operations									101,017	78,164	63,854
Other income (expense)
Interest income (expense), net									(47,872)	(48,144)	(52,167)
Loss from debt extinguishment							24,964		0	(38,890)	0
Other, net									491	3,154	2,646
Total other income (expense)									(47,381)	(83,880)	(49,521)
Income (loss) before taxes									53,636	(5,716)	14,333
Provision (benefit) for income taxes									19,347	(5,539)	7,543
Income (loss) before equity in net income of subsidiaries									34,289	(177)	6,790
Equity in net income (loss) of subsidiaries									0	0	0
Income (loss) from continuing operations									34,289	(177)	6,790
Loss from operations of discontinued businesses									0	0	(4,651)
Benefit from income taxes									0	0	1,628
Loss from discontinued operations									0	0	(3,023)
Net income (loss)	$ 10,803	$ 10,893	$ 5,122	$ 7,471	$ 7,948	$ 14,464	$ (25,825)	$ 3,236	34,289	(177)	3,767
Other comprehensive income (loss), net of taxes									(61,124)	(26,725)	16,220
Comprehensive income (loss)									(26,835)	(26,902)	19,987
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									22,637	24,084	24,248
Restructuring and other related charges									0	0	0
Total operating expenses									22,637	24,084	24,248
Income from operations									(22,637)	(24,084)	(24,248)
Other income (expense)
Interest income (expense), net									(8,741)	(10,079)	(14,381)
Loss from debt extinguishment										(38,890)
Other, net									438	111	569
Total other income (expense)									(8,303)	(48,858)	(13,812)
Income (loss) before taxes									(30,940)	(72,942)	(38,060)
Provision (benefit) for income taxes									(11,041)	(32,044)	(14,888)
Income (loss) before equity in net income of subsidiaries									(19,899)	(40,898)	(23,172)
Equity in net income (loss) of subsidiaries									54,188	40,721	26,939
Income (loss) from continuing operations									34,289	(177)	3,767
Loss from operations of discontinued businesses									0	0	0
Benefit from income taxes									0	0	0
Loss from discontinued operations									0	0	0
Net income (loss)									34,289	(177)	3,767
Comprehensive income (loss)									(26,835)	(26,902)	19,987
Guarantor Subsidiaries [Member]
Condensed Income Statements, Captions [Line Items]
Revenue									1,581,295	1,526,678	1,459,705
Cost of goods and services									1,204,872	1,156,268	1,107,440
Gross profit									376,423	370,410	352,265
Selling, general and administrative expenses									272,421	281,930	269,654
Restructuring and other related charges									0	4,234	9,236
Total operating expenses									272,421	286,164	278,890
Income from operations									104,002	84,246	73,375
Other income (expense)
Interest income (expense), net									(30,547)	(28,630)	(27,660)
Other, net									10,521	7,945	9,656
Total other income (expense)									(20,026)	(20,685)	(18,004)
Income (loss) before taxes									83,976	63,561	55,371
Provision (benefit) for income taxes									31,100	26,480	20,603
Income (loss) before equity in net income of subsidiaries									52,876	37,081	34,768
Equity in net income (loss) of subsidiaries									3,062	3,531	(1,467)
Income (loss) from continuing operations									55,938	40,612	33,301
Loss from operations of discontinued businesses									0	0	0
Benefit from income taxes									0	0	0
Loss from discontinued operations									0	0	0
Net income (loss)									55,938	40,612	33,301
Comprehensive income (loss)									34,318	28,355	10,903
Non-Guarantor Subsidiaries [Member]
Condensed Income Statements, Captions [Line Items]
Revenue									475,380	519,349	463,767
Cost of goods and services									377,348	424,568	392,588
Gross profit									98,032	94,781	71,179
Selling, general and administrative expenses									80,073	75,551	52,819
Restructuring and other related charges									0	1,902	4,026
Total operating expenses									80,073	77,453	56,845
Income from operations									17,959	17,328	14,334
Other income (expense)
Interest income (expense), net									(8,584)	(9,435)	(10,126)
Other, net									(8,775)	(4,228)	(7,233)
Total other income (expense)									(17,359)	(13,663)	(17,359)
Income (loss) before taxes									600	3,665	(3,025)
Provision (benefit) for income taxes									(712)	25	1,781
Income (loss) before equity in net income of subsidiaries									1,312	3,640	(4,806)
Equity in net income (loss) of subsidiaries									52,876	37,081	34,768
Income (loss) from continuing operations									54,188	40,721	29,962
Loss from operations of discontinued businesses									0	0	(4,651)
Benefit from income taxes									0	0	1,628
Loss from discontinued operations									0	0	(3,023)
Net income (loss)									54,188	40,721	26,939
Comprehensive income (loss)									15,080	25,704	64,671
Elimination [Member]
Condensed Income Statements, Captions [Line Items]
Revenue									(40,643)	(54,216)	(52,145)
Cost of goods and services									(41,966)	(48,424)	(46,286)
Gross profit									1,323	(5,792)	(5,859)
Selling, general and administrative expenses									(370)	(6,466)	(6,252)
Restructuring and other related charges									0	0	0
Total operating expenses									(370)	(6,466)	(6,252)
Income from operations									1,693	674	393
Other income (expense)
Interest income (expense), net									0	0	0
Other, net									(1,693)	(674)	(346)
Total other income (expense)									(1,693)	(674)	(346)
Income (loss) before taxes									0	0	47
Provision (benefit) for income taxes									0	0	47
Income (loss) before equity in net income of subsidiaries									0	0	0
Equity in net income (loss) of subsidiaries									(110,126)	(81,333)	(60,240)
Income (loss) from continuing operations									(110,126)	(81,333)	(60,240)
Loss from operations of discontinued businesses									0	0	0
Benefit from income taxes									0	0	0
Loss from discontinued operations									0	0	0
Net income (loss)									(110,126)	(81,333)	(60,240)
Comprehensive income (loss)									$ (49,398)	$ (54,059)	$ (75,574)