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, 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
Condensed Income Statements, Captions [Line Items]
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
Cost of goods and services									1,448,358	1,116,881	1,076,342
Gross profit	148,451	138,792	121,473	120,844	114,519	97,984	98,869	96,744	529,560	408,116	400,693
Selling, general and administrative expenses									433,110	339,089	318,353
Restructuring and other related charges										0	0
Total operating expenses										339,089	318,353
Income from continuing operations									96,450	69,027	82,340
Other income (expense)
Interest income (expense), net									(63,871)	(51,449)	(49,877)
Other, net									1,231	(880)	(250)
Total other income (expense)									(62,640)	(52,329)	(50,127)
Income before taxes from continuing operations									33,810	16,698	32,213
Provision (benefit) for income taxes									555	(1,085)	12,432
Income (loss) before equity in net income of subsidiaries									33,255	17,783	19,781
Equity in net income (loss) of subsidiaries									0	0	0
Income (loss) 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
Income from operations of discontinued businesses									119,981	22,276	20,952
Provision for income taxes									27,558	25,147	10,723
Income (loss) from discontinued operations									92,423	(2,871)	10,229
Net income									125,678	14,912	30,010
Other comprehensive income, net of tax									26,369	20,760	9,947
Comprehensive income (loss)									152,047	35,672	39,957
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									38,691	42,273	26,427
Restructuring and other related charges										0	0
Total operating expenses										42,273	26,427
Income from continuing operations									(38,691)	(42,273)	(26,427)
Other income (expense)
Interest income (expense), net									(23,911)	(13,804)	(12,549)
Other, net									(6,515)	59	337
Total other income (expense)									(30,426)	(13,745)	(12,212)
Income before taxes from continuing operations									(69,117)	(56,018)	(38,639)
Provision (benefit) for income taxes									(17,692)	(11,338)	4,964
Income (loss) before equity in net income of subsidiaries									(51,425)	(44,680)	(43,603)
Equity in net income (loss) of subsidiaries									177,103	59,592	73,613
Income (loss) from continuing operations									125,678	14,912	30,010
Income from operations of discontinued businesses									0	0	0
Provision for income taxes									0	0	0
Income (loss) from discontinued operations									0	0	0
Net income									125,678	14,912	30,010
Comprehensive income (loss)									152,047	35,672	39,957
Guarantor Subsidiaries [Member]
Condensed Income Statements, Captions [Line Items]
Revenue									1,638,792	1,284,189	1,277,241
Cost of goods and services									1,232,019	966,293	952,296
Gross profit									406,773	317,896	324,945
Selling, general and administrative expenses									303,856	232,720	228,961
Restructuring and other related charges										0	1,299
Total operating expenses										232,720	230,260
Income from continuing operations									102,917	85,176	94,685
Other income (expense)
Interest income (expense), net									(31,913)	(24,242)	(24,050)
Other, net									120,670	1,395	1,862
Total other income (expense)									88,757	(22,847)	(22,188)
Income before taxes from continuing operations									191,674	62,329	72,497
Provision (benefit) for income taxes									9,546	24,560	29,445
Income (loss) before equity in net income of subsidiaries									182,128	37,769	43,052
Equity in net income (loss) of subsidiaries									(151,864)	(25,231)	(2,858)
Income (loss) from continuing operations									30,264	12,538	40,194
Income from operations of discontinued businesses									119,981	16,827	15,625
Provision for income taxes									27,558	4,476	4,720
Income (loss) from discontinued operations									92,423	12,351	10,905
Net income									122,687	24,889	51,099
Comprehensive income (loss)									143,936	35,575	44,391
Non-Guarantor Subsidiaries [Member]
Condensed Income Statements, Captions [Line Items]
Revenue									367,149	270,520	228,350
Cost of goods and services									245,687	181,634	154,181
Gross profit									121,462	88,886	74,169
Selling, general and administrative expenses									90,933	64,466	63,335
Restructuring and other related charges										0	(1,299)
Total operating expenses										64,466	62,036
Income from continuing operations									30,529	24,420	12,133
Other income (expense)
Interest income (expense), net									(8,047)	(13,403)	(13,278)
Other, net									(111,187)	(630)	(500)
Total other income (expense)									(119,234)	(14,033)	(13,778)
Income before taxes from continuing operations									(88,705)	10,387	(1,645)
Provision (benefit) for income taxes									8,743	(14,307)	(21,977)
Income (loss) before equity in net income of subsidiaries									(97,448)	24,694	20,332
Equity in net income (loss) of subsidiaries									182,128	37,770	43,052
Income (loss) from continuing operations									84,680	62,464	63,384
Income from operations of discontinued businesses									0	5,449	5,327
Provision for income taxes									0	20,671	6,003
Income (loss) from discontinued operations									0	(15,222)	(676)
Net income									84,680	47,242	62,708
Comprehensive income (loss)									81,389	38,337	90,560
Consolidation, Eliminations [Member]
Condensed Income Statements, Captions [Line Items]
Revenue									(28,023)	(29,712)	(28,556)
Cost of goods and services									(29,348)	(31,046)	(30,135)
Gross profit									1,325	1,334	1,579
Selling, general and administrative expenses									(370)	(370)	(370)
Restructuring and other related charges										0	0
Total operating expenses										(370)	(370)
Income from continuing operations									1,695	1,704	1,949
Other income (expense)
Interest income (expense), net									0	0	0
Other, net									(1,737)	(1,704)	(1,949)
Total other income (expense)									(1,737)	(1,704)	(1,949)
Income before taxes from continuing operations									(42)	0	0
Provision (benefit) for income taxes									(42)	0	0
Income (loss) before equity in net income of subsidiaries									0	0	0
Equity in net income (loss) of subsidiaries									(207,367)	(72,131)	(113,807)
Income (loss) from continuing operations									(207,367)	(72,131)	(113,807)
Income from operations of discontinued businesses									0	0	0
Provision for income taxes									0	0	0
Income (loss) from discontinued operations									0	0	0
Net income									(207,367)	(72,131)	(113,807)
Comprehensive income (loss)									$ (225,325)	$ (73,912)	$ (134,951)