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, 2017	Mar. 31, 2016	Mar. 31, 2017	Mar. 31, 2016
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	$ 5,045	$ 6,095	$ 17,309	$ 16,883
Net cash provided by (used in) operating activities			8,771	(3,216)
CASH FLOWS FROM INVESTING ACTIVITIES:
Acquisition of property, plant and equipment	(20,035)	(20,934)	(42,513)	(45,952)
Acquired businesses, net of cash acquired			0	(2,726)
Acquired businesses, net of cash acquired			6,051	1,744
Investment sales	0			715
Proceeds from sale of assets			140	868
Net cash used in investing activities			(48,424)	(48,839)
CASH FLOWS FROM FINANCING ACTIVITIES:
Purchase of shares for treasury			(15,759)	(33,640)
Proceeds from long-term debt			195,655	139,604
Payments of long-term debt			(123,264)	(46,323)
Change in short-term borrowings			(488)	(191)
Share premium payment on settled debt			(24,997)	0
Financing costs			(335)	(1,120)
Purchase of ESOP shares			(9,213)	0
Dividends paid			(5,137)	(4,508)
Other, net			(186)	307
Net cash provided by financing activities			16,276	54,129
CASH FLOWS FROM DISCONTINUED OPERATIONS:
Net cash used in discontinued operations			(738)	(578)
Effect of exchange rate changes on cash and equivalents			(1,013)	785
NET INCREASE (DECREASE) IN CASH AND EQUIVALENTS			(25,128)	2,281
CASH AND EQUIVALENTS AT BEGINNING OF PERIOD			72,553	52,001
CASH AND EQUIVALENTS AT END OF PERIOD	47,425	54,282	47,425	54,282
Parent Company [Member]
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	5,045	6,095	17,309	16,883
Net cash provided by (used in) operating activities			(54,311)	(55,560)
CASH FLOWS FROM INVESTING ACTIVITIES:
Acquisition of property, plant and equipment			(11)	(186)
Acquired businesses, net of cash acquired				0
Acquired businesses, net of cash acquired			0	0
Investment sales				715
Proceeds from sale of assets			0	0
Net cash used in investing activities			(11)	529
CASH FLOWS FROM FINANCING ACTIVITIES:
Purchase of shares for treasury			(15,759)	(33,640)
Proceeds from long-term debt			185,213	115,000
Payments of long-term debt			(101,577)	(20,601)
Change in short-term borrowings			0	0
Share premium payment on settled debt			(24,997)
Financing costs			(335)	(1,012)
Purchase of ESOP shares			(9,213)
Dividends paid			(5,137)	(4,508)
Other, net			21,026	307
Net cash provided by financing activities			49,221	55,546
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			(5,101)	515
CASH AND EQUIVALENTS AT BEGINNING OF PERIOD			6,517	2,440
CASH AND EQUIVALENTS AT END OF PERIOD	1,416	2,955	1,416	2,955
Guarantor Companies [Member]
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	13,866	11,621	27,721	22,889
Net cash provided by (used in) operating activities			24,399	51,805
CASH FLOWS FROM INVESTING ACTIVITIES:
Acquisition of property, plant and equipment			(30,030)	(37,970)
Acquired businesses, net of cash acquired				(2,726)
Acquired businesses, net of cash acquired			0	0
Investment sales				0
Proceeds from sale of assets			112	764
Net cash used in investing activities			(29,918)	(39,932)
CASH FLOWS FROM FINANCING ACTIVITIES:
Purchase of shares for treasury			0	0
Proceeds from long-term debt			0	2,361
Payments of long-term debt			(1,112)	(1,064)
Change in short-term borrowings			0	0
Share premium payment on settled debt			0
Financing costs			0	0
Purchase of ESOP shares			0
Dividends paid			0	0
Other, net			(13,656)	(7,248)
Net cash provided by financing activities			(14,768)	(5,951)
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			(20,287)	5,922
CASH AND EQUIVALENTS AT BEGINNING OF PERIOD			27,692	10,671
CASH AND EQUIVALENTS AT END OF PERIOD	7,405	16,593	7,405	16,593
Non-Guarantor Companies [Member]
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	13,842	11,654	27,655	22,913
Net cash provided by (used in) operating activities			38,683	539
CASH FLOWS FROM INVESTING ACTIVITIES:
Acquisition of property, plant and equipment			(12,472)	(7,796)
Acquired businesses, net of cash acquired				0
Acquired businesses, net of cash acquired			6,051	1,744
Investment sales				0
Proceeds from sale of assets			28	104
Net cash used in investing activities			(18,495)	(9,436)
CASH FLOWS FROM FINANCING ACTIVITIES:
Purchase of shares for treasury			0	0
Proceeds from long-term debt			10,442	22,243
Payments of long-term debt			(20,575)	(24,658)
Change in short-term borrowings			(488)	(191)
Share premium payment on settled debt			0
Financing costs			0	(108)
Purchase of ESOP shares			0
Dividends paid			0	0
Other, net			(7,556)	7,248
Net cash provided by financing activities			(18,177)	4,534
CASH FLOWS FROM DISCONTINUED OPERATIONS:
Net cash used in discontinued operations			(738)	(578)
Effect of exchange rate changes on cash and equivalents			(1,013)	785
NET INCREASE (DECREASE) IN CASH AND EQUIVALENTS			260	(4,156)
CASH AND EQUIVALENTS AT BEGINNING OF PERIOD			38,344	38,890
CASH AND EQUIVALENTS AT END OF PERIOD	38,604	34,734	38,604	34,734
Elimination [Member]
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	(27,708)	(23,275)	(55,376)	(45,802)
Net cash provided by (used in) operating activities			0	0
CASH FLOWS FROM INVESTING ACTIVITIES:
Acquisition of property, plant and equipment			0	0
Acquired businesses, net of cash acquired				0
Acquired businesses, net of cash acquired			0	0
Investment sales				0
Proceeds from sale of assets			0	0
Net cash used in investing activities			0	0
CASH FLOWS FROM FINANCING ACTIVITIES:
Purchase of shares for treasury			0	0
Proceeds from long-term debt			0	0
Payments of long-term debt			0	0
Change in short-term borrowings			0	0
Share premium payment on settled debt			0
Financing costs			0	0
Purchase of ESOP shares			0
Dividends paid			0	0
Other, net			0	0
Net cash provided by financing activities			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
CASH AND EQUIVALENTS AT END OF PERIOD	$ 0	$ 0	$ 0	$ 0