CONSOLIDATING GUARANTOR AND NON-GUARANTOR FINANCIAL INFORMATION (Details) - Summary of consolidated cash flows (USD $)	0 Months Ended	3 Months Ended								12 Months Ended
	Oct. 17, 2011	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2012
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income (loss)		$ 7,948,000	$ 14,464,000	$ (25,825,000)	$ 3,236,000	$ 425,000	$ 3,603,000	$ (819,000)	$ 558,000	$ (177,000)	$ 3,767,000	$ 17,011,000
Net cash provided by (used in) operating activities										93,301,000	85,683,000	90,130,000
CASH FLOWS FROM INVESTING ACTIVITIES:
Acquisition of property, plant and equipment										(77,094,000)	(64,441,000)	(68,851,000)
Acquired business, net of cash acquired	(22,432,000)									(62,306,000)	0	(22,432,000)
Intercompany distributions										0	0	0
Purchase of securities										(8,402,000)	0	0
Proceeds from sale of property, plant and equipment										552,000	1,573,000	309,000
Net cash used in investing activities										(147,250,000)	(62,868,000)	(90,974,000)
CASH FLOWS FROM FINANCING ACTIVITIES:
Proceeds from issuance of common stock										584,000	0	0
Purchase of shares for treasury										(79,614,000)	(32,521,000)	(10,382,000)
Proceeds from issuance of debt										691,943,000	303,000	4,000,000
Payments of long-term debt										(603,094,000)	(16,867,000)	(18,546,000)
Change in short-term borrowings										(749,000)	2,950,000	(1,859,000)
Financing costs										(11,298,000)	(833,000)	(97,000)
Purchase of ESOP shares										(20,000,000)	0	0
Tax effect from exercise/vesting of equity awards, net										273,000	150,000	834,000
Dividend										(6,273,000)	(5,825,000)	(4,743,000)
Other, net										298,000	394,000	100,000
Net cash used in financing activities										(27,930,000)	(52,249,000)	(30,693,000)
CASH FLOWS FROM DISCONTINUED OPERATIONS:
Net cash used in discontinued operations										(1,528,000)	(2,090,000)	(2,801,000)
Effect of exchange rate changes on cash and equivalents										(2,318,000)	0	963,000
NET DECREASE IN CASH AND EQUIVALENTS										(85,725,000)	(31,524,000)	(33,375,000)
CASH AND EQUIVALENTS AT BEGINNING OF PERIOD					178,130,000				209,654,000	178,130,000	209,654,000	243,029,000
CASH AND EQUIVALENTS AT END OF PERIOD		92,405,000				178,130,000				92,405,000	178,130,000	209,654,000
Parent Company [Member]
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income (loss)										(177,000)	3,767,000	17,011,000
Net cash provided by (used in) operating activities										(3,902,000)	(25,184,000)	(24,315,000)
CASH FLOWS FROM INVESTING ACTIVITIES:
Acquisition of property, plant and equipment										(700,000)	(123,000)	(155,000)
Acquired business, net of cash acquired										0		0
Intercompany distributions										10,000,000	10,000,000	10,000,000
Purchase of securities										(8,402,000)
Proceeds from sale of property, plant and equipment										0	0	0
Net cash used in investing activities										898,000	9,877,000	9,845,000
CASH FLOWS FROM FINANCING ACTIVITIES:
Proceeds from issuance of common stock										584,000
Purchase of shares for treasury										(79,614,000)	(32,521,000)	(10,382,000)
Proceeds from issuance of debt										659,568,000	0	(23,000,000)
Payments of long-term debt										(598,250,000)	(2,157,000)	(1,625,000)
Change in short-term borrowings										0	0	0
Financing costs										(10,763,000)	(833,000)	(65,000)
Purchase of ESOP shares										(20,000,000)
Tax effect from exercise/vesting of equity awards, net										273,000	150,000	834,000
Dividend										(11,273,000)	(5,825,000)	(4,743,000)
Other, net										298,000	394,000	96,000
Net cash used in financing activities										(59,177,000)	(40,792,000)	(38,885,000)
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 DECREASE IN CASH AND EQUIVALENTS										(62,181,000)	(56,099,000)	(53,355,000)
CASH AND EQUIVALENTS AT BEGINNING OF PERIOD					68,994,000				125,093,000	68,994,000	125,093,000	178,448,000
CASH AND EQUIVALENTS AT END OF PERIOD		6,813,000				68,994,000				6,813,000	68,994,000	125,093,000
Guarantor Subsidiaries [Member]
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income (loss)										40,612,000	33,301,000	30,304,000
Net cash provided by (used in) operating activities										17,168,000	83,177,000	93,349,000
CASH FLOWS FROM INVESTING ACTIVITIES:
Acquisition of property, plant and equipment										(64,320,000)	(56,617,000)	(63,388,000)
Acquired business, net of cash acquired										2,675,000		(22,432,000)
Intercompany distributions										(10,000,000)	(10,000,000)	(10,000,000)
Purchase of securities										0
Proceeds from sale of property, plant and equipment										360,000	1,404,000	200,000
Net cash used in investing activities										(71,285,000)	(65,213,000)	(95,620,000)
CASH FLOWS FROM FINANCING ACTIVITIES:
Proceeds from issuance of common stock										0
Purchase of shares for treasury										0	0	0
Proceeds from issuance of debt										(102,000)	303,000	491,372,000
Payments of long-term debt										(1,135,000)	(1,032,000)	(4,351,000)
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	0
Dividend										5,000,000	0	(219,516,000)
Other, net										56,533,000	(26,674,000)	(245,616,000)
Net cash used in financing activities										60,296,000	(27,403,000)	21,889,000
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 DECREASE IN CASH AND EQUIVALENTS										6,179,000	(9,439,000)	19,618,000
CASH AND EQUIVALENTS AT BEGINNING OF PERIOD					25,343,000				34,782,000	25,343,000	34,782,000	15,164,000
CASH AND EQUIVALENTS AT END OF PERIOD		31,522,000				25,343,000				31,522,000	25,343,000	34,782,000
Non-Guarantor Subsidiaries [Member]
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income (loss)										40,721,000	26,939,000	30,158,000
Net cash provided by (used in) operating activities										80,035,000	27,690,000	21,096,000
CASH FLOWS FROM INVESTING ACTIVITIES:
Acquisition of property, plant and equipment										(12,074,000)	(7,701,000)	(5,308,000)
Acquired business, net of cash acquired										(64,981,000)		0
Intercompany distributions										0	0	0
Purchase of securities										0
Proceeds from sale of property, plant and equipment										192,000	169,000	109,000
Net cash used in investing activities										(76,863,000)	(7,532,000)	(5,199,000)
CASH FLOWS FROM FINANCING ACTIVITIES:
Proceeds from issuance of common stock										0
Purchase of shares for treasury										0	0	0
Proceeds from issuance of debt										32,477,000	0	27,000,000
Payments of long-term debt										(3,709,000)	(13,678,000)	(12,570,000)
Change in short-term borrowings										(749,000)	2,950,000	(1,859,000)
Financing costs										(535,000)	0	(32,000)
Purchase of ESOP shares										0
Tax effect from exercise/vesting of equity awards, net										0	0	0
Dividend										0	0	219,516,000
Other, net										(56,533,000)	26,674,000	(245,752,000)
Net cash used in financing activities										(29,049,000)	15,946,000	(13,697,000)
CASH FLOWS FROM DISCONTINUED OPERATIONS:
Net cash used in discontinued operations										(1,528,000)	(2,090,000)	(2,801,000)
Effect of exchange rate changes on cash and equivalents										(2,318,000)	0	963,000
NET DECREASE IN CASH AND EQUIVALENTS										(29,723,000)	34,014,000	362,000
CASH AND EQUIVALENTS AT BEGINNING OF PERIOD					83,793,000				49,779,000	83,793,000	49,779,000	49,417,000
CASH AND EQUIVALENTS AT END OF PERIOD		54,070,000				83,793,000				54,070,000	83,793,000	49,779,000
Elimination [Member]
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income (loss)										(81,333,000)	(60,240,000)	(60,462,000)
Net cash provided by (used in) operating activities										0	0	0
CASH FLOWS FROM INVESTING ACTIVITIES:
Acquisition of property, plant and equipment										0	0	0
Acquired business, net of cash acquired										0		0
Intercompany distributions										0	0	0
Purchase of securities										0
Proceeds from sale of property, plant and equipment										0	0	0
Net cash used in investing activities										0	0	0
CASH FLOWS FROM FINANCING ACTIVITIES:
Proceeds from issuance of common stock										0
Purchase of shares for treasury										0	0	0
Proceeds from issuance of debt										0	0	(491,372,000)
Payments of long-term debt										0	0	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	0
Dividend										0	0	0
Other, net										0	0	491,372,000
Net cash used in financing activities										0	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 DECREASE IN CASH AND EQUIVALENTS										0	0	0
CASH AND EQUIVALENTS AT BEGINNING OF PERIOD					0				0	0	0	0
CASH AND EQUIVALENTS AT END OF PERIOD		$ 0				$ 0				$ 0	$ 0	$ 0