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, 2019	Dec. 31, 2018	Mar. 31, 2018	Dec. 31, 2017	Mar. 31, 2019	Mar. 31, 2018
Condensed Income Statements, Captions [Line Items]
Revenue	$ 549,633		$ 478,560		$ 1,060,155	$ 915,863
Cost of goods and services	412,129		357,181		779,605	673,705
Gross profit	137,504		121,379		280,550	242,158
Selling, general and administrative expenses	111,783		104,493		225,537	211,117
Income from operations	25,721		16,886		55,013	31,041
Other income (expense)
Interest income (expense), net	(17,305)		(16,044)		(33,636)	(32,686)
Other, net	1,268		2,346		2,272	2,760
Total other expense, net	(16,037)		(13,698)		(31,364)	(29,926)
Income before taxes from continuing operations	9,684		3,188		23,649	1,115
Provision (benefit) for income taxes	3,194		1,237		8,406	(23,667)
Income (loss) before equity in net income of subsidiaries	6,490		1,951		15,243	24,782
Equity in net income (loss) of subsidiaries	0		0		0	0
Income from continuing operations	6,490		1,951		15,243	24,782
Income (loss) from operations of discontinued operations	(11,000)		113,376		(11,000)	124,842
Provision (benefit) for income taxes	(3,354)		25,047		(3,354)	28,355
Income (loss) from discontinued operations	(7,646)		88,329		(7,646)	96,487
Net income (loss)	(1,156)	$ 8,753	90,280	$ 30,989	7,597	121,269
Comprehensive income, net	1,724		110,681		5,027	150,028
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	5,249		5,438		10,309	16,775
Income from operations	(5,249)		(5,438)		(10,309)	(16,775)
Other income (expense)
Interest income (expense), net	(7,328)		(5,961)		(13,635)	(12,735)
Other, net	(473)		697		(735)	692
Total other expense, net	(7,801)		(5,264)		(14,370)	(12,043)
Income before taxes from continuing operations	(13,050)		(10,702)		(24,679)	(28,818)
Provision (benefit) for income taxes	(4,242)		(10,168)		(7,777)	(39,860)
Income (loss) before equity in net income of subsidiaries	(8,808)		(534)		(16,902)	11,042
Equity in net income (loss) of subsidiaries	7,652		90,814		24,499	110,227
Income from continuing operations	(1,156)		90,280		7,597	121,269
Income (loss) from operations of discontinued operations	0		0		0	0
Provision (benefit) for income taxes	0		0		0	0
Income (loss) from discontinued operations	0		0		0	0
Net income (loss)	(1,156)		90,280		7,597	121,269
Comprehensive income, net	1,724		110,681		5,027	150,028
Guarantor Companies [Member]
Condensed Income Statements, Captions [Line Items]
Revenue	462,739		397,759		881,983	749,071
Cost of goods and services	354,382		305,919		663,479	568,559
Gross profit	108,357		91,840		218,504	180,512
Selling, general and administrative expenses	84,813		65,871		169,789	141,201
Income from operations	23,544		25,969		48,715	39,311
Other income (expense)
Interest income (expense), net	(9,128)		(8,013)		(18,258)	(14,215)
Other, net	1,129		12,149		1,816	13,353
Total other expense, net	(7,999)		4,136		(16,442)	(862)
Income before taxes from continuing operations	15,545		30,105		32,273	38,449
Provision (benefit) for income taxes	5,292		(10,037)		11,266	(7,302)
Income (loss) before equity in net income of subsidiaries	10,253		40,142		21,007	45,751
Equity in net income (loss) of subsidiaries	11,646		(59,707)		17,696	(60,359)
Income from continuing operations	21,899		(19,565)		38,703	(14,608)
Income (loss) from operations of discontinued operations	0		(8,423)		0	(2,003)
Provision (benefit) for income taxes	0		859		0	2,918
Income (loss) from discontinued operations	0		(9,282)		0	(4,921)
Net income (loss)	21,899		(28,847)		38,703	(19,529)
Comprehensive income, net	5,448		1,444		59,017	24,212
Non-Guarantor Companies [Member]
Condensed Income Statements, Captions [Line Items]
Revenue	94,285		89,910		192,525	182,429
Cost of goods and services	65,516		60,627		131,218	121,406
Gross profit	28,769		29,283		61,307	61,023
Selling, general and administrative expenses	21,409		33,277		45,226	53,326
Income from operations	7,360		(3,994)		16,081	7,697
Other income (expense)
Interest income (expense), net	(849)		(2,070)		(1,743)	(5,736)
Other, net	676		(10,038)		1,717	(10,361)
Total other expense, net	(173)		(12,108)		(26)	(16,097)
Income before taxes from continuing operations	7,187		(16,102)		16,055	(8,400)
Provision (benefit) for income taxes	2,142		(6,202)		4,917	(4,146)
Income (loss) before equity in net income of subsidiaries	5,045		(9,900)		11,138	(4,254)
Equity in net income (loss) of subsidiaries	10,253		40,140		21,007	45,751
Income from continuing operations	15,298		30,240		32,145	41,497
Income (loss) from operations of discontinued operations	(11,000)		121,799		(11,000)	126,845
Provision (benefit) for income taxes	(3,354)		24,188		(3,354)	25,437
Income (loss) from discontinued operations	(7,646)		97,611		(7,646)	101,408
Net income (loss)	7,652		127,851		24,499	142,905
Comprehensive income, net	8,736		123,670		4,185	171,118
Elimination [Member]
Condensed Income Statements, Captions [Line Items]
Revenue	(7,391)		(9,109)		(14,353)	(15,637)
Cost of goods and services	(7,769)		(9,365)		(15,092)	(16,260)
Gross profit	378		256		739	623
Selling, general and administrative expenses	312		(93)		213	(185)
Income from operations	66		349		526	808
Other income (expense)
Interest income (expense), net	0		0		0	0
Other, net	(64)		(462)		(526)	(924)
Total other expense, net	(64)		(462)		(526)	(924)
Income before taxes from continuing operations	2		(113)		0	(116)
Provision (benefit) for income taxes	2		27,644		0	27,641
Income (loss) before equity in net income of subsidiaries	0		(27,757)		0	(27,757)
Equity in net income (loss) of subsidiaries	(29,551)		(71,247)		(63,202)	(95,619)
Income from continuing operations	(29,551)		(99,004)		(63,202)	(123,376)
Income (loss) from operations of discontinued operations	0		0		0	0
Provision (benefit) for income taxes	0		0		0	0
Income (loss) from discontinued operations	0		0		0	0
Net income (loss)	(29,551)		(99,004)		(63,202)	(123,376)
Comprehensive income, net	$ (14,184)		$ (125,114)		$ (63,202)	$ (195,330)