CONSOLIDATING GUARANTOR AND NON-GUARANTOR FINANCIAL INFORMATION (Details) - Summary of Condensed Consolidating Statements of Operations and Comprehensive Income (Loss) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2018	Mar. 31, 2017
Condensed Income Statements, Captions [Line Items]
Revenue	$ 478,560	$ 383,807	$ 915,863	$ 736,084
Cost of goods and services	357,087	284,938	673,546	540,471
Gross profit	121,473	98,869	242,317	195,613
Selling, general and administrative expenses	103,675	81,933	209,482	160,817
Restructuring and other related charges				0
Total operating expenses				160,817
Income from operations	17,798	16,936	32,835	34,796
Other income (expense)
Interest income (expense), net	(16,044)	(12,705)	(32,686)	(25,994)
Other, net	1,434	(62)	966	(202)
Total other expense, net	(14,610)	(12,767)	(31,720)	(26,196)
Income before taxes from continuing operations	3,188	4,169	1,115	8,600
Provision (benefit) for income taxes	1,237	2,219	(23,667)	(394)
Income (loss) before equity in net income of subsidiaries	1,951	1,950	24,782	8,994
Equity in net income (loss) of subsidiaries	0	0	0	0
Income from continuing operations	1,951	1,950	24,782	8,994
Income from operations of discontinued operations (including a gain on sale of $117,625 in 2018)	113,376	6,070	124,842	14,615
Provision for income taxes (including tax on gain on sale of $31,268 in 2018)	25,047	2,975	28,355	6,300
Income from discontinued operations (including a gain on sale, net of tax of $86,357 in 2018)	88,329	3,095	96,487	8,315
Net income	90,280	5,045	121,269	17,309
Comprehensive income (loss), net	110,681	12,978	150,028	13,930
Parent Company [Member]
Condensed Income Statements, Captions [Line Items]
Revenue	0	0	0	0
Cost of goods and services	0	0	0	0
Gross profit	0	0	0	0
Selling, general and administrative expenses	6,014	7,077	17,351	13,721
Restructuring and other related charges				0
Total operating expenses				13,721
Income from operations	(6,014)	(7,077)	(17,351)	(13,721)
Other income (expense)
Interest income (expense), net	(5,961)	(3,323)	(12,735)	(7,350)
Other, net	1,273	(29)	1,268	(57)
Total other expense, net	(4,688)	(3,352)	(11,467)	(7,407)
Income before taxes from continuing operations	(10,702)	(10,429)	(28,818)	(21,128)
Provision (benefit) for income taxes	(10,168)	(1,534)	(39,860)	(10,563)
Income (loss) before equity in net income of subsidiaries	(534)	(8,895)	11,042	(10,565)
Equity in net income (loss) of subsidiaries	90,814	13,940	110,227	27,874
Income from continuing operations	90,280	5,045	121,269	17,309
Income from operations of discontinued operations (including a gain on sale of $117,625 in 2018)	0	0	0	0
Provision for income taxes (including tax on gain on sale of $31,268 in 2018)	0	0		0
Income from discontinued operations (including a gain on sale, net of tax of $86,357 in 2018)	0	0	0	0
Net income	90,280	5,045	121,269	17,309
Comprehensive income (loss), net	110,681	12,978	150,028	13,930
Guarantor Companies [Member]
Condensed Income Statements, Captions [Line Items]
Revenue	397,759	328,493	749,071	619,829
Cost of goods and services	305,825	250,265	568,400	469,104
Gross profit	91,934	78,228	180,671	150,725
Selling, general and administrative expenses	64,417	58,615	138,930	113,605
Restructuring and other related charges				0
Total operating expenses				113,605
Income from operations	27,517	19,613	41,741	37,120
Other income (expense)
Interest income (expense), net	(8,012)	(6,068)	(14,215)	(12,023)
Other, net	10,601	599	10,923	1,001
Total other expense, net	2,589	(5,469)	(3,292)	(11,022)
Income before taxes from continuing operations	30,106	14,144	38,449	26,098
Provision (benefit) for income taxes	(10,037)	4,592	(7,302)	10,457
Income (loss) before equity in net income of subsidiaries	40,143	9,552	45,751	15,641
Equity in net income (loss) of subsidiaries	(59,708)	(4,633)	(60,359)	(8,616)
Income from continuing operations	(19,565)	4,919	(14,608)	7,025
Income from operations of discontinued operations (including a gain on sale of $117,625 in 2018)	(8,423)	5,302	(2,003)	8,793
Provision for income taxes (including tax on gain on sale of $31,268 in 2018)	859	836	2,918	2,639
Income from discontinued operations (including a gain on sale, net of tax of $86,357 in 2018)	(9,282)	4,466	(4,921)	6,154
Net income	(28,847)	9,385	(19,529)	13,179
Comprehensive income (loss), net	1,444	10,601	24,212	7,752
Non-Guarantor Companies [Member]
Condensed Income Statements, Captions [Line Items]
Revenue	89,910	64,758	182,429	133,309
Cost of goods and services	60,627	44,388	121,406	88,942
Gross profit	29,283	20,370	61,023	44,367
Selling, general and administrative expenses	33,337	16,334	53,386	33,676
Restructuring and other related charges				0
Total operating expenses				33,676
Income from operations	(4,054)	4,036	7,637	10,691
Other income (expense)
Interest income (expense), net	(2,071)	(3,314)	(5,736)	(6,621)
Other, net	(9,978)	(268)	(10,301)	(440)
Total other expense, net	(12,049)	(3,582)	(16,037)	(7,061)
Income before taxes from continuing operations	(16,103)	454	(8,400)	3,630
Provision (benefit) for income taxes	(6,202)	(839)	(4,146)	(288)
Income (loss) before equity in net income of subsidiaries	(9,901)	1,293	(4,254)	3,918
Equity in net income (loss) of subsidiaries	40,141	9,551	45,751	15,641
Income from continuing operations	30,240	10,844	41,497	19,559
Income from operations of discontinued operations (including a gain on sale of $117,625 in 2018)	121,799	768	126,845	5,822
Provision for income taxes (including tax on gain on sale of $31,268 in 2018)	24,188	2,139	25,437	3,661
Income from discontinued operations (including a gain on sale, net of tax of $86,357 in 2018)	97,611	(1,371)	101,408	2,161
Net income	127,851	9,473	142,905	21,720
Comprehensive income (loss), net	123,670	8,257	171,118	27,147
Elimination [Member]
Condensed Income Statements, Captions [Line Items]
Revenue	(9,109)	(9,444)	(15,637)	(17,054)
Cost of goods and services	(9,365)	(9,715)	(16,260)	(17,575)
Gross profit	256	271	623	521
Selling, general and administrative expenses	(93)	(93)	(185)	(185)
Restructuring and other related charges				0
Total operating expenses				(185)
Income from operations	349	364	808	706
Other income (expense)
Interest income (expense), net	0	0	0	0
Other, net	(462)	(364)	(924)	(706)
Total other expense, net	(462)	(364)	(924)	(706)
Income before taxes from continuing operations	(113)	0	(116)	0
Provision (benefit) for income taxes	27,644	0	27,641	0
Income (loss) before equity in net income of subsidiaries	(27,757)	0	(27,757)	0
Equity in net income (loss) of subsidiaries	(71,247)	(18,858)	(95,619)	(34,899)
Income from continuing operations	(99,004)	(18,858)	(123,376)	(34,899)
Income from operations of discontinued operations (including a gain on sale of $117,625 in 2018)	0	0	0	0
Provision for income taxes (including tax on gain on sale of $31,268 in 2018)	0	0	0	0
Income from discontinued operations (including a gain on sale, net of tax of $86,357 in 2018)	0	0	0	0
Net income	(99,004)	(18,858)	(123,376)	(34,899)
Comprehensive income (loss), net	$ (125,114)	$ (18,858)	$ (195,330)	$ (34,899)