CONSOLIDATING GUARANTOR AND NON-GUARANTOR FINANCIAL INFORMATION (Details) - Summary of consolidated cash flows - USD ($)	12 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2016
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	$ 125,678,000	$ 14,912,000	$ 30,010,000
Net (income) loss from discontinued operations	(92,423,000)	2,871,000	(10,229,000)
Net cash provided by (used in) operating activities	66,446,000	49,151,000	80,118,000
CASH FLOWS FROM INVESTING ACTIVITIES - CONTINUING OPERATIONS:
Acquisition of property, plant and equipment	(50,138,000)	(34,937,000)	(59,276,000)
Acquired business, net of cash acquired	(430,932,000)	(34,719,000)	(4,470,000)
Intercompany distributions	0		4,470,000
Proceeds from Divestiture of Businesses	474,727,000	0	0
Proceeds from sale of property, plant and equipment	663,000	143,000	770,000
Investment purchases	0	1,824,000	(715,000)
Net cash used in investing activities - continuing operations	(5,680,000)	(71,337,000)	(62,261,000)
CASH FLOWS FROM FINANCING ACTIVITIES - CONTINUING OPERATIONS:
Proceeds from issuance of common stock	0	0	0
Purchase of shares for treasury	(45,605,000)	(15,841,000)	(65,307,000)
Proceeds from long-term debt	443,058,000	233,443,000	302,362,000
Payments of long-term debt	(300,993,000)	(170,454,000)	(208,514,000)
Share premium payment on settled debt	0	(24,997,000)	0
Change in short-term borrowings	144,000	0	0
Financing costs	(7,793,000)	(1,548,000)	(4,384,000)
Purchase of ESOP shares	0	(10,908,000)	0
Tax effect from exercise/vesting of equity awards, net	0		0
Dividends	(49,797,000)	(10,325,000)	(8,798,000)
Other, net	51,000	(70,000)	55,000
Net cash provided by (used) in financing activities - continuing operations	39,065,000	(700,000)	15,414,000
CASH FLOWS FROM DISCONTINUED OPERATIONS:
Net cash used in discontinued operations	(78,927,000)	(2,150,000)	(13,605,000)
Effect of exchange rate changes on cash and equivalents	1,173,000	164,000	886,000
NET INCREASE (DECREASE) IN CASH AND EQUIVALENTS	22,077,000	(24,872,000)	20,552,000
CASH AND EQUIVALENTS AT BEGINNING OF PERIOD	47,681,000	72,553,000	52,001,000
CASH AND EQUIVALENTS AT END OF PERIOD	69,758,000	47,681,000	72,553,000
Parent Company [Member]
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	125,678,000	14,912,000	30,010,000
Net (income) loss from discontinued operations	0	0	0
Net cash provided by (used in) operating activities	389,671,000	(10,771,000)	(11,879,000)
CASH FLOWS FROM INVESTING ACTIVITIES - CONTINUING OPERATIONS:
Acquisition of property, plant and equipment	(544,000)	(15,000)	(259,000)
Acquired business, net of cash acquired	(368,936,000)	0
Intercompany distributions	0		0
Proceeds from Divestiture of Businesses	0
Proceeds from sale of property, plant and equipment	0	0	0
Investment purchases		1,824,000	(715,000)
Net cash used in investing activities - continuing operations	(369,480,000)	(1,839,000)	456,000
CASH FLOWS FROM FINANCING ACTIVITIES - CONTINUING OPERATIONS:
Proceeds from issuance of common stock	0
Purchase of shares for treasury	(45,605,000)	(15,841,000)	(65,307,000)
Proceeds from long-term debt	411,623,000	201,124,000	271,340,000
Payments of long-term debt	(269,478,000)	(149,109,000)	(177,513,000)
Share premium payment on settled debt		(24,997,000)
Change in short-term borrowings	0	0	0
Financing costs	(7,793,000)	(1,548,000)	(4,277,000)
Purchase of ESOP shares		(10,908,000)
Tax effect from exercise/vesting of equity awards, net	0		0
Dividends	(49,797,000)	(10,325,000)	(8,798,000)
Other, net	(46,405,000)	20,937,000	55,000
Net cash provided by (used) in financing activities - continuing operations	(7,455,000)	9,333,000	15,500,000
CASH FLOWS FROM DISCONTINUED OPERATIONS:
Net cash used in discontinued operations	0	0	0
Effect of exchange rate changes on cash and equivalents	0	0	0
NET INCREASE (DECREASE) IN CASH AND EQUIVALENTS	12,736,000	(3,277,000)	4,077,000
CASH AND EQUIVALENTS AT BEGINNING OF PERIOD	3,240,000	6,517,000	2,440,000
CASH AND EQUIVALENTS AT END OF PERIOD	15,976,000	3,240,000	6,517,000
Guarantor Subsidiaries [Member]
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	122,687,000	24,889,000	51,099,000
Net (income) loss from discontinued operations	(92,423,000)	(12,351,000)	(10,905,000)
Net cash provided by (used in) operating activities	(405,174,000)	56,320,000	87,252,000
CASH FLOWS FROM INVESTING ACTIVITIES - CONTINUING OPERATIONS:
Acquisition of property, plant and equipment	(41,531,000)	(27,902,000)	(62,176,000)
Acquired business, net of cash acquired	(4,843,000)	0
Intercompany distributions	0		2,726,000
Proceeds from Divestiture of Businesses	474,727,000
Proceeds from sale of property, plant and equipment	62,000	144,000	763,000
Investment purchases		0	0
Net cash used in investing activities - continuing operations	428,415,000	(27,758,000)	(64,139,000)
CASH FLOWS FROM FINANCING ACTIVITIES - CONTINUING OPERATIONS:
Proceeds from issuance of common stock	0
Purchase of shares for treasury	0	0	0
Proceeds from long-term debt	2,125,000	0	2,311,000
Payments of long-term debt	(5,403,000)	(1,282,000)	(1,237,000)
Share premium payment on settled debt		0
Change in short-term borrowings	144,000	0	0
Financing costs	0	0	0
Purchase of ESOP shares		0
Tax effect from exercise/vesting of equity awards, net	0		0
Dividends	0	0	0
Other, net	4,733,000	(34,806,000)	(1,926,000)
Net cash provided by (used) in financing activities - continuing operations	1,599,000	(36,088,000)	(852,000)
CASH FLOWS FROM DISCONTINUED OPERATIONS:
Net cash used in discontinued operations	(16,394,000)	(12,100,000)	(5,241,000)
Effect of exchange rate changes on cash and equivalents	(159,000)	0	0
NET INCREASE (DECREASE) IN CASH AND EQUIVALENTS	8,287,000	(19,626,000)	17,020,000
CASH AND EQUIVALENTS AT BEGINNING OF PERIOD	8,066,000	27,692,000	10,672,000
CASH AND EQUIVALENTS AT END OF PERIOD	16,353,000	8,066,000	27,692,000
Non-Guarantor Subsidiaries [Member]
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	84,680,000	47,242,000	62,708,000
Net (income) loss from discontinued operations	0	15,222,000	676,000
Net cash provided by (used in) operating activities	108,981,000	3,602,000	4,745,000
CASH FLOWS FROM INVESTING ACTIVITIES - CONTINUING OPERATIONS:
Acquisition of property, plant and equipment	(8,063,000)	(7,020,000)	3,159,000
Acquired business, net of cash acquired	(57,153,000)	(34,719,000)
Intercompany distributions	0		1,744,000
Proceeds from Divestiture of Businesses	0
Proceeds from sale of property, plant and equipment	601,000	(1,000)	7,000
Investment purchases		0	0
Net cash used in investing activities - continuing operations	(64,615,000)	(41,740,000)	1,422,000
CASH FLOWS FROM FINANCING ACTIVITIES - CONTINUING OPERATIONS:
Proceeds from issuance of common stock	0
Purchase of shares for treasury	0	0	0
Proceeds from long-term debt	29,310,000	32,319,000	28,711,000
Payments of long-term debt	(26,112,000)	(20,063,000)	(29,764,000)
Share premium payment on settled debt		0
Change in short-term borrowings	0	0	0
Financing costs	0	0	(107,000)
Purchase of ESOP shares		0
Tax effect from exercise/vesting of equity awards, net	0		0
Dividends	0	0	0
Other, net	14,691,000	13,799,000	1,926,000
Net cash provided by (used) in financing activities - continuing operations	17,889,000	26,055,000	766,000
CASH FLOWS FROM DISCONTINUED OPERATIONS:
Net cash used in discontinued operations	(62,533,000)	9,950,000	(8,364,000)
Effect of exchange rate changes on cash and equivalents	1,332,000	164,000	886,000
NET INCREASE (DECREASE) IN CASH AND EQUIVALENTS	1,054,000	(1,969,000)	(545,000)
CASH AND EQUIVALENTS AT BEGINNING OF PERIOD	36,375,000	38,344,000	38,889,000
CASH AND EQUIVALENTS AT END OF PERIOD	37,429,000	36,375,000	38,344,000
Consolidation, Eliminations [Member]
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	(207,367,000)	(72,131,000)	(113,807,000)
Net (income) loss from discontinued operations	0	0	0
Net cash provided by (used in) operating activities	(27,032,000)	0	0
CASH FLOWS FROM INVESTING ACTIVITIES - CONTINUING OPERATIONS:
Acquisition of property, plant and equipment	0	0	0
Acquired business, net of cash acquired	0	0
Intercompany distributions	0		0
Proceeds from Divestiture of Businesses	0
Proceeds from sale of property, plant and equipment	0	0	0
Investment purchases		0	0
Net cash used in investing activities - continuing operations	0	0	0
CASH FLOWS FROM FINANCING ACTIVITIES - CONTINUING OPERATIONS:
Proceeds from issuance of common stock	0
Purchase of shares for treasury	0	0	0
Proceeds from long-term debt	0	0	0
Payments of long-term debt	0	0	0
Share premium payment on settled debt		0
Change in short-term borrowings	0	0	0
Financing costs	0	0	0
Purchase of ESOP shares		0
Tax effect from exercise/vesting of equity awards, net	0		0
Dividends	0	0	0
Other, net	27,032,000	0	0
Net cash provided by (used) in financing activities - continuing operations	27,032,000	0	0
CASH FLOWS FROM DISCONTINUED OPERATIONS:
Net cash used in discontinued operations	0	0	0
Effect of exchange rate changes on cash and equivalents	0	0	0
NET INCREASE (DECREASE) IN CASH AND EQUIVALENTS	0	0	0
CASH AND EQUIVALENTS AT BEGINNING OF PERIOD	0	0	0
CASH AND EQUIVALENTS AT END OF PERIOD	$ 0	$ 0	$ 0