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, 2016	Mar. 31, 2015	Mar. 31, 2016	Mar. 31, 2015
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	$ 6,095	$ 5,122	$ 14,691	$ 12,593
Net cash provided by (used in) operating activities			(5,408)	(43,051)
CASH FLOWS FROM INVESTING ACTIVITIES:
Acquisition of property, plant and equipment	(20,934)	(20,792)	(45,952)	(39,713)
Acquired businesses, net of cash acquired			(4,470)	0
Intercompany distributions				0
Investment sales			715	8,891
Proceeds from sale of assets			868	177
Net cash used in investing activities			(48,839)	(30,645)
CASH FLOWS FROM FINANCING ACTIVITIES:
Proceeds from issuance of common stock			0	285
Purchase of shares for treasury			(33,640)	(37,577)
Proceeds from long-term debt			139,604	99,556
Payments of long-term debt			(46,323)	(29,425)
Change in short-term borrowings			(191)	(572)
Financing costs			(1,120)	(590)
Tax effect from exercise/vesting of equity awards, net			2,291	345
Dividend			(4,508)	(3,911)
Other, net			208	95
Net cash provided by financing activities			56,321	28,206
CASH FLOWS FROM DISCONTINUED OPERATIONS:
Net cash used in discontinued operations			(578)	(545)
Effect of exchange rate changes on cash and equivalents			785	(3,768)
NET INCREASE (DECREASE) IN CASH AND EQUIVALENTS			2,281	(49,803)
CASH AND EQUIVALENTS AT BEGINNING OF PERIOD			52,001	92,405
CASH AND EQUIVALENTS AT END OF PERIOD	54,282	42,602	54,282	42,602
Parent Company [Member]
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	6,095	5,122	14,691	12,593
Net cash provided by (used in) operating activities			(57,752)	(49,888)
CASH FLOWS FROM INVESTING ACTIVITIES:
Acquisition of property, plant and equipment			(186)	(188)
Acquired businesses, net of cash acquired			0
Intercompany distributions				10,000
Investment sales			715	8,891
Proceeds from sale of assets			0	0
Net cash used in investing activities			529	18,703
CASH FLOWS FROM FINANCING ACTIVITIES:
Proceeds from issuance of common stock				285
Purchase of shares for treasury			(33,640)	(37,577)
Proceeds from long-term debt			115,000	97,000
Payments of long-term debt			(20,601)	(28,101)
Change in short-term borrowings			0	0
Financing costs			(1,012)	(590)
Tax effect from exercise/vesting of equity awards, net			2,291	345
Dividend			(4,508)	(3,911)
Other, net			208	95
Net cash provided by financing activities			57,738	27,546
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			515	(3,639)
CASH AND EQUIVALENTS AT BEGINNING OF PERIOD			2,440	6,813
CASH AND EQUIVALENTS AT END OF PERIOD	2,955	3,174	2,955	3,174
Guarantor Companies [Member]
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	11,621	11,567	22,889	22,921
Net cash provided by (used in) operating activities			51,805	(451)
CASH FLOWS FROM INVESTING ACTIVITIES:
Acquisition of property, plant and equipment			(37,970)	(30,584)
Acquired businesses, net of cash acquired			(2,726)
Intercompany distributions				(10,000)
Investment sales			0	0
Proceeds from sale of assets			764	12
Net cash used in investing activities			(39,932)	(40,572)
CASH FLOWS FROM FINANCING ACTIVITIES:
Proceeds from issuance of common stock				0
Purchase of shares for treasury			0	0
Proceeds from long-term debt			2,361	0
Payments of long-term debt			(1,064)	(717)
Change in short-term borrowings			0	0
Financing costs			0	0
Tax effect from exercise/vesting of equity awards, net			0	0
Dividend			0	0
Other, net			(7,248)	21,021
Net cash provided by financing activities			(5,951)	20,304
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			5,922	(20,719)
CASH AND EQUIVALENTS AT BEGINNING OF PERIOD			10,671	31,522
CASH AND EQUIVALENTS AT END OF PERIOD	16,593	10,803	16,593	10,803
Non-Guarantor Companies [Member]
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	11,654	10,142	22,913	21,510
Net cash provided by (used in) operating activities			539	7,288
CASH FLOWS FROM INVESTING ACTIVITIES:
Acquisition of property, plant and equipment			(7,796)	(8,941)
Acquired businesses, net of cash acquired			$ (1,744)
Intercompany distributions				0
Investment sales				0
Proceeds from sale of assets			$ 104	165
Net cash used in investing activities			(9,436)	(8,776)
CASH FLOWS FROM FINANCING ACTIVITIES:
Proceeds from issuance of common stock				0
Purchase of shares for treasury			0	0
Proceeds from long-term debt			22,243	2,556
Payments of long-term debt			(24,658)	(607)
Change in short-term borrowings			(191)	(572)
Financing costs			(108)	0
Tax effect from exercise/vesting of equity awards, net			0	0
Dividend			0	0
Other, net			7,248	(21,021)
Net cash provided by financing activities			4,534	(19,644)
CASH FLOWS FROM DISCONTINUED OPERATIONS:
Net cash used in discontinued operations			(578)	(545)
Effect of exchange rate changes on cash and equivalents			785	(3,768)
NET INCREASE (DECREASE) IN CASH AND EQUIVALENTS			(4,156)	(25,445)
CASH AND EQUIVALENTS AT BEGINNING OF PERIOD			38,890	54,070
CASH AND EQUIVALENTS AT END OF PERIOD	34,734	28,625	34,734	28,625
Elimination [Member]
CASH FLOWS FROM INVESTING ACTIVITIES:
Acquired businesses, net of cash acquired			0
Investment sales			0
Elimination [Member]
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	(23,275)	(21,709)	(45,802)	(44,431)
Net cash provided by (used in) operating activities			0	0
CASH FLOWS FROM INVESTING ACTIVITIES:
Acquisition of property, plant and equipment			0	0
Intercompany distributions				0
Investment sales				0
Proceeds from sale of assets			0	0
Net cash used in investing activities			0	0
CASH FLOWS FROM FINANCING ACTIVITIES:
Proceeds from issuance of common stock				0
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
Financing costs			0	0
Tax effect from exercise/vesting of equity awards, net			0	0
Dividend			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