CONSOLIDATING GUARANTOR AND NON-GUARANTOR FINANCIAL INFORMATION (Details) - Summary of Condensed Consolidating Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended			9 Months Ended
	Jun. 30, 2016	Dec. 31, 2015	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	$ 7,596		$ 10,893	$ 22,287	$ 23,486
Net cash provided by (used in) operating activities				57,555	29,586
CASH FLOWS FROM INVESTING ACTIVITIES:
Acquisition of property, plant and equipment	(17,295)		(15,652)	(63,247)	(55,365)
Acquired businesses, net of cash acquired				(4,470)	(2,225)
Intercompany distributions					0
Investment sales		$ 715		715	8,891
Proceeds from sale of assets				914	275
Net cash used in investing activities				(66,088)	(48,424)
CASH FLOWS FROM FINANCING ACTIVITIES:
Proceeds from issuance of common stock				0	371
Purchase of shares for treasury				(50,771)	(58,218)
Proceeds from long-term debt				263,249	121,523
Payments of long-term debt				(177,973)	(80,495)
Change in short-term borrowings				(45)	(81)
Financing costs				(4,135)	(592)
Tax effect from exercise/vesting of equity awards, net				2,291	345
Dividend				(6,686)	(5,807)
Other, net				(86)	206
Net cash provided by (used in) financing activities				25,844	(22,748)
CASH FLOWS FROM DISCONTINUED OPERATIONS:
Net cash used in discontinued operations				(1,152)	(830)
Effect of exchange rate changes on cash and equivalents				456	(4,034)
NET INCREASE (DECREASE) IN CASH AND EQUIVALENTS				16,615	(46,450)
CASH AND EQUIVALENTS AT BEGINNING OF PERIOD		52,001		52,001	92,405
CASH AND EQUIVALENTS AT END OF PERIOD	68,616		45,955	68,616	45,955
Parent Company [Member]
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	7,596		10,893	22,287	23,486
Net cash provided by (used in) operating activities				(15,620)	4,582
CASH FLOWS FROM INVESTING ACTIVITIES:
Acquisition of property, plant and equipment				(221)	(203)
Acquired businesses, net of cash acquired				0	0
Intercompany distributions					10,000
Investment sales				715	8,891
Proceeds from sale of assets				0	0
Net cash used in investing activities				494	18,688
CASH FLOWS FROM FINANCING ACTIVITIES:
Proceeds from issuance of common stock					371
Purchase of shares for treasury				(50,771)	(58,218)
Proceeds from long-term debt				238,450	112,000
Payments of long-term debt				(143,785)	(73,652)
Change in short-term borrowings				0	0
Financing costs				(4,028)	(592)
Tax effect from exercise/vesting of equity awards, net				2,291	345
Dividend				(6,686)	(5,807)
Other, net				(86)	206
Net cash provided by (used in) financing activities				35,385	(25,347)
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				20,259	(2,077)
CASH AND EQUIVALENTS AT BEGINNING OF PERIOD		2,440		2,440	6,813
CASH AND EQUIVALENTS AT END OF PERIOD	22,699		4,736	22,699	4,736
Guarantor Companies [Member]
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	28,742		16,038	51,631	38,959
Net cash provided by (used in) operating activities				54,730	16,063
CASH FLOWS FROM INVESTING ACTIVITIES:
Acquisition of property, plant and equipment				(51,494)	(40,918)
Acquired businesses, net of cash acquired				(2,726)	(2,225)
Intercompany distributions					(10,000)
Investment sales				0	0
Proceeds from sale of assets				757	90
Net cash used in investing activities				(53,463)	(53,053)
CASH FLOWS FROM FINANCING ACTIVITIES:
Proceeds from issuance of common stock					0
Purchase of shares for treasury				0	0
Proceeds from long-term debt				2,336	116
Payments of long-term debt				(1,599)	(1,009)
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				(3,984)	19,254
Net cash provided by (used in) financing activities				(3,247)	18,361
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				(1,980)	(18,629)
CASH AND EQUIVALENTS AT BEGINNING OF PERIOD		10,671		10,671	31,522
CASH AND EQUIVALENTS AT END OF PERIOD	8,691		12,893	8,691	12,893
Non-Guarantor Companies [Member]
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	30,468		16,105	53,381	37,615
Net cash provided by (used in) operating activities				18,445	8,941
CASH FLOWS FROM INVESTING ACTIVITIES:
Acquisition of property, plant and equipment				(11,532)	(14,244)
Acquired businesses, net of cash acquired				(1,744)	0
Intercompany distributions					0
Investment sales					0
Proceeds from sale of assets				157	185
Net cash used in investing activities				(13,119)	(14,059)
CASH FLOWS FROM FINANCING ACTIVITIES:
Proceeds from issuance of common stock					0
Purchase of shares for treasury				0	0
Proceeds from long-term debt				22,463	9,407
Payments of long-term debt				(32,589)	(5,834)
Change in short-term borrowings				(45)	(81)
Financing costs				(107)	0
Tax effect from exercise/vesting of equity awards, net				0	0
Dividend				0	0
Other, net				3,984	(19,254)
Net cash provided by (used in) financing activities				(6,294)	(15,762)
CASH FLOWS FROM DISCONTINUED OPERATIONS:
Net cash used in discontinued operations				(1,152)	(830)
Effect of exchange rate changes on cash and equivalents				456	(4,034)
NET INCREASE (DECREASE) IN CASH AND EQUIVALENTS				(1,664)	(25,744)
CASH AND EQUIVALENTS AT BEGINNING OF PERIOD		38,890		38,890	54,070
CASH AND EQUIVALENTS AT END OF PERIOD	37,226		28,326	37,226	28,326
Elimination [Member]
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	(59,210)		(32,143)	(105,012)	(76,574)
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	0
Intercompany distributions					0
Investment sales				0	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 (used in) 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	0
CASH AND EQUIVALENTS AT END OF PERIOD	$ 0		$ 0	$ 0	$ 0