CONSOLIDATING GUARANTOR AND NON-GUARANTOR FINANCIAL INFORMATION (Details) - Summary of consolidated cash flows (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2011
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income (loss)	$ 425	$ 3,603	$ (819)	$ 558	$ 3,448	$ 9,048	$ 2,027	$ 2,488	$ 3,767	$ 17,011	$ (7,431)
Net cash provided by (used in) operating activities									85,683	90,130	35,385
CASH FLOWS FROM INVESTING ACTIVITIES:
Acquisition of property, plant and equipment									(64,441)	(68,851)	(87,617)
Acquired business, net of cash acquired										(22,432)	(855)
Intercompany distributions									0	0
Funds restricted for capital projects											4,629
Proceeds from sale of assets									1,573	309	1,510
Net cash provided by (used in) investing activities									(62,868)	(90,974)	(82,333)
CASH FLOWS FROM FINANCING ACTIVITIES:
Purchase of shares for treasury									(32,521)	(10,382)	(18,139)
Proceeds from issuance of long-term debt									303	4,000	674,251
Payments of long-term debt									(16,867)	(18,546)	(498,572)
Change in short-term borrowings									2,950	(1,859)	3,538
Intercompany debt											0
Financing costs									(833)	(97)	(21,653)
Purchase of ESOP shares											(19,973)
Exercise of stock options											2,306
Tax effect from exercise/vesting of equity awards, net									150	834	7
Dividend									(5,825)	(4,743)	0
Other, net									394	100	345
Net cash provided by (used in) financing activities									(52,249)	(30,693)	122,110
CASH FLOWS FROM DISCONTINUED OPERATIONS:
Net cash used in discontinued operations									(2,090)	(2,801)	(962)
Effect of exchange rate changes on cash and equivalents										963	(973)
NET INCREASE (DECREASE) IN CASH AND EQUIVALENTS									(31,524)	(33,375)	73,227
CASH AND EQUIVALENTS AT BEGINNING OF PERIOD				209,654				243,029	209,654	243,029	169,802
CASH AND EQUIVALENTS AT END OF PERIOD	178,130				209,654				178,130	209,654	243,029
Parent Company [Member]
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income (loss)									5,269	18,353	(7,955)
Net cash provided by (used in) operating activities									(25,184)	(24,315)	43,407
CASH FLOWS FROM INVESTING ACTIVITIES:
Acquisition of property, plant and equipment									(123)	(155)	(418)
Acquired business, net of cash acquired										0
Intercompany distributions									10,000	10,000	10,000
Proceeds from sale of assets									0	0
Net cash provided by (used in) investing activities									9,877	9,845	9,582
CASH FLOWS FROM FINANCING ACTIVITIES:
Purchase of shares for treasury									(32,521)	(10,382)	(18,139)
Proceeds from issuance of long-term debt									0	(23,000)	569,973
Payments of long-term debt									(2,157)	(1,625)	(625)
Change in short-term borrowings									0	0
Intercompany debt											(468,372)
Financing costs									(833)	(65)	(14,663)
Purchase of ESOP shares											(19,973)
Exercise of stock options											2,306
Tax effect from exercise/vesting of equity awards, net									150	834	7
Dividend									(5,825)	(4,743)
Other, net									394	96	345
Net cash provided by (used in) financing activities									(40,792)	(38,885)	50,859
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									(56,099)	(53,355)	103,848
CASH AND EQUIVALENTS AT BEGINNING OF PERIOD				125,093				178,448	125,093	178,448	74,600
CASH AND EQUIVALENTS AT END OF PERIOD	68,994				125,093				68,994	125,093	178,448
Guarantor Subsidiaries [Member]
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income (loss)									34,803	31,646	23,350
Net cash provided by (used in) operating activities									83,177	93,349	38,657
CASH FLOWS FROM INVESTING ACTIVITIES:
Acquisition of property, plant and equipment									(56,617)	(63,388)	(55,455)
Acquired business, net of cash acquired								(22,432)		(22,432)	(1,066)
Intercompany distributions									(10,000)	(10,000)	(10,000)
Funds restricted for capital projects											4,629
Proceeds from sale of assets									1,404	200	68
Net cash provided by (used in) investing activities									(65,213)	(95,620)	(61,824)
CASH FLOWS FROM FINANCING ACTIVITIES:
Purchase of shares for treasury									0	0
Proceeds from issuance of long-term debt									303	491,372
Payments of long-term debt									(1,032)	(4,351)	(31,138)
Change in short-term borrowings									0	0
Intercompany debt											0
Financing costs									0	0
Tax effect from exercise/vesting of equity awards, net									0	0
Dividend									0	(219,516)
Other, net									(26,674)	(245,616)	12,356
Net cash provided by (used in) financing activities									(27,403)	21,889	(18,782)
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									(9,439)	19,618	(41,949)
CASH AND EQUIVALENTS AT BEGINNING OF PERIOD				34,782				15,164	34,782	15,164	57,113
CASH AND EQUIVALENTS AT END OF PERIOD	25,343				34,782				25,343	34,782	15,164
Non-Guarantor Subsidiaries [Member]
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income (loss)									28,441	31,500	7,013
Net cash provided by (used in) operating activities									27,690	21,096	(46,679)
CASH FLOWS FROM INVESTING ACTIVITIES:
Acquisition of property, plant and equipment									(7,701)	(5,308)	(31,744)
Acquired business, net of cash acquired											211
Intercompany distributions									0	0
Proceeds from sale of assets									169	109	1,442
Net cash provided by (used in) investing activities									(7,532)	(5,199)	(30,091)
CASH FLOWS FROM FINANCING ACTIVITIES:
Purchase of shares for treasury									0	0
Proceeds from issuance of long-term debt									0	27,000	104,278
Payments of long-term debt									(13,678)	(12,570)	(466,809)
Change in short-term borrowings									2,950	(1,859)	3,538
Intercompany debt											468,372
Financing costs									0	(32)	(6,990)
Tax effect from exercise/vesting of equity awards, net									0	0
Dividend									0	219,516
Other, net									26,674	(245,752)	(12,356)
Net cash provided by (used in) financing activities									15,946	(13,697)	90,033
CASH FLOWS FROM DISCONTINUED OPERATIONS:
Net cash used in discontinued operations									(2,090)	(2,801)	(962)
Effect of exchange rate changes on cash and equivalents										963	(973)
NET INCREASE (DECREASE) IN CASH AND EQUIVALENTS									34,014	362	11,328
CASH AND EQUIVALENTS AT BEGINNING OF PERIOD				49,779				49,417	49,779	49,417	38,089
CASH AND EQUIVALENTS AT END OF PERIOD	83,793				49,779				83,793	49,779	49,417
Consolidation, Eliminations [Member]
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income (loss)									(64,746)	(64,488)	(29,839)
Net cash provided by (used in) operating activities									0	0
CASH FLOWS FROM INVESTING ACTIVITIES:
Acquisition of property, plant and equipment									0	0
Acquired business, net of cash acquired										0
Intercompany distributions									0	0
Proceeds from sale of assets									0	0
Net cash provided by (used in) investing activities									0	0
CASH FLOWS FROM FINANCING ACTIVITIES:
Purchase of shares for treasury									0	0
Proceeds from issuance of long-term debt									0	(491,372)
Payments of long-term debt									0	0
Change in short-term borrowings									0
Financing costs									0	0
Tax effect from exercise/vesting of equity awards, net									0	0
Dividend									0	0
Other, net									0	491,372	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	0
CASH AND EQUIVALENTS AT END OF PERIOD	$ 0				$ 0				$ 0	$ 0	$ 0