CONSOLIDATING GUARANTOR AND NON-GUARANTOR FINANCIAL INFORMATION (Details) - Summary of Condensed Consolidating Statements of Cash Flows - 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
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	$ (1,156)	$ 8,753	$ 90,280	$ 30,989	$ 7,597	$ 121,269
Net (income) loss from discontinued operations	7,646		(88,329)		7,646	(96,487)
Net cash provided by (used in) operating activities					(55,006)	(47,100)
CASH FLOWS FROM INVESTING ACTIVITIES - CONTINUING OPERATIONS:
Acquisition of property, plant and equipment	(9,021)		(10,843)		(17,418)	(21,628)
Acquired businesses, net of cash acquired					(9,219)	(246,230)
Investment purchase					(149)	0
Proceeds from sale of business					0	473,977
Insurance proceeds (payments)					(10,604)	8,254
Proceeds from sale of assets					62	454
Net cash provided by (used in) investing activities - continuing operations					(37,328)	214,827
CASH FLOWS FROM FINANCING ACTIVITIES - CONTINUING OPERATIONS:
Purchase of shares for treasury					(1,478)	(32,861)
Proceeds from long-term debt					143,101	347,898
Payments of long-term debt					(48,169)	(229,941)
Financing costs					(945)	(7,451)
Contingent consideration for acquired businesses					(1,686)	0
Dividends paid					(6,847)	(5,872)
Other, net					83	126
Net cash provided by financing activities - continuing operations					84,059	71,899
CASH FLOWS FROM DISCONTINUED OPERATIONS:
Net cash used in discontinued operations					(3,438)	(48,383)
Effect of exchange rate changes on cash and equivalents					(66)	(2,468)
NET INCREASE (DECREASE) IN CASH AND EQUIVALENTS					(11,779)	188,775
CASH AND EQUIVALENTS AT BEGINNING OF PERIOD		69,758		47,681	69,758	47,681
CASH AND EQUIVALENTS AT END OF PERIOD	57,979		236,456		57,979	236,456
Parent Company [Member]
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	(1,156)		90,280		7,597	121,269
Net (income) loss from discontinued operations	0		0		0	0
Net cash provided by (used in) operating activities					(77,881)	275,619
CASH FLOWS FROM INVESTING ACTIVITIES - CONTINUING OPERATIONS:
Acquisition of property, plant and equipment					(210)	(331)
Acquired businesses, net of cash acquired					(9,219)	(185,729)
Investment purchase					(149)
Proceeds from sale of business						0
Insurance proceeds (payments)					(10,604)	8,254
Proceeds from sale of assets					0	0
Net cash provided by (used in) investing activities - continuing operations					(20,182)	(177,806)
CASH FLOWS FROM FINANCING ACTIVITIES - CONTINUING OPERATIONS:
Purchase of shares for treasury					(1,478)	(32,861)
Proceeds from long-term debt					130,484	342,161
Payments of long-term debt					(32,419)	(197,322)
Financing costs					(945)	(7,451)
Contingent consideration for acquired businesses					0
Dividends paid					(6,847)	(5,872)
Other, net					(1,641)	(22,279)
Net cash provided by financing activities - continuing operations					87,154	76,376
CASH FLOWS FROM DISCONTINUED OPERATIONS:
Net cash used in discontinued operations					0	0
Effect of exchange rate changes on cash and equivalents					0	0
NET INCREASE (DECREASE) IN CASH AND EQUIVALENTS					(10,909)	174,189
CASH AND EQUIVALENTS AT BEGINNING OF PERIOD		15,976		3,240	15,976	3,240
CASH AND EQUIVALENTS AT END OF PERIOD	5,067		177,429		5,067	177,429
Guarantor Companies [Member]
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	21,899		(28,847)		38,703	(19,529)
Net (income) loss from discontinued operations	0		9,282		0	4,921
Net cash provided by (used in) operating activities					24,130	(360,855)
CASH FLOWS FROM INVESTING ACTIVITIES - CONTINUING OPERATIONS:
Acquisition of property, plant and equipment					(14,071)	(16,208)
Acquired businesses, net of cash acquired					0	(5,076)
Investment purchase					0
Proceeds from sale of business						473,977
Insurance proceeds (payments)					0	0
Proceeds from sale of assets					36	21
Net cash provided by (used in) investing activities - continuing operations					(14,035)	452,714
CASH FLOWS FROM FINANCING ACTIVITIES - CONTINUING OPERATIONS:
Purchase of shares for treasury					0	0
Proceeds from long-term debt					76	2,195
Payments of long-term debt					(1,724)	(1,613)
Financing costs					0	0
Contingent consideration for acquired businesses					0
Dividends paid					0	0
Other, net					7,150	(40,668)
Net cash provided by financing activities - continuing operations					5,502	(40,086)
CASH FLOWS FROM DISCONTINUED OPERATIONS:
Net cash used in discontinued operations					0	(36,875)
Effect of exchange rate changes on cash and equivalents					(92)	(27)
NET INCREASE (DECREASE) IN CASH AND EQUIVALENTS					15,505	14,871
CASH AND EQUIVALENTS AT BEGINNING OF PERIOD		16,353		8,066	16,353	8,066
CASH AND EQUIVALENTS AT END OF PERIOD	31,858		22,937		31,858	22,937
Non-Guarantor Companies [Member]
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	7,652		127,851		24,499	142,905
Net (income) loss from discontinued operations	7,646		(97,611)		7,646	(101,408)
Net cash provided by (used in) operating activities					(1,255)	38,136
CASH FLOWS FROM INVESTING ACTIVITIES - CONTINUING OPERATIONS:
Acquisition of property, plant and equipment					(3,137)	(5,089)
Acquired businesses, net of cash acquired					0	(55,425)
Investment purchase					0
Proceeds from sale of business						0
Insurance proceeds (payments)					0	0
Proceeds from sale of assets					26	433
Net cash provided by (used in) investing activities - continuing operations					(3,111)	(60,081)
CASH FLOWS FROM FINANCING ACTIVITIES - CONTINUING OPERATIONS:
Purchase of shares for treasury					0	0
Proceeds from long-term debt					12,541	3,542
Payments of long-term debt					(14,026)	(31,006)
Financing costs					0	0
Contingent consideration for acquired businesses					(1,686)
Dividends paid					0	0
Other, net					(5,426)	63,073
Net cash provided by financing activities - continuing operations					(8,597)	35,609
CASH FLOWS FROM DISCONTINUED OPERATIONS:
Net cash used in discontinued operations					(3,438)	(11,508)
Effect of exchange rate changes on cash and equivalents					26	(2,441)
NET INCREASE (DECREASE) IN CASH AND EQUIVALENTS					(16,375)	(285)
CASH AND EQUIVALENTS AT BEGINNING OF PERIOD		37,429		36,375	37,429	36,375
CASH AND EQUIVALENTS AT END OF PERIOD	21,054		36,090		21,054	36,090
Elimination [Member]
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	(29,551)		(99,004)		(63,202)	(123,376)
Net (income) loss from discontinued operations	0		0		0	0
Net cash provided by (used in) operating activities					0	0
CASH FLOWS FROM INVESTING ACTIVITIES - CONTINUING OPERATIONS:
Acquisition of property, plant and equipment					0	0
Acquired businesses, net of cash acquired					0	0
Investment purchase					0
Proceeds from sale of business						0
Insurance proceeds (payments)					0	0
Proceeds from sale of assets					0	0
Net cash provided by (used in) investing activities - continuing operations					0	0
CASH FLOWS FROM FINANCING ACTIVITIES - CONTINUING OPERATIONS:
Purchase of shares for treasury					0	0
Proceeds from long-term debt					0	0
Payments of long-term debt					0	0
Financing costs					0	0
Contingent consideration for acquired businesses					0
Dividends paid					0	0
Other, net					0	0
Net cash provided by financing activities - continuing operations					0	0
CASH FLOWS FROM DISCONTINUED OPERATIONS:
Net cash used in discontinued operations					0	0
Effect of exchange rate changes on cash and equivalents					0	0
NET INCREASE (DECREASE) IN CASH AND EQUIVALENTS					0	0
CASH AND EQUIVALENTS AT BEGINNING OF PERIOD		$ 0		$ 0	0	0
CASH AND EQUIVALENTS AT END OF PERIOD	$ 0		$ 0		$ 0	$ 0