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CONSOLIDATING GUARANTOR AND NON-GUARANTOR FINANCIAL INFORMATION (Details) - Summary of consolidated cash flows - USD ($) | 12 Months Ended
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Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2016
CASH FLOWS FROM OPERATING ACTIVITIES: |  |  |
Net income | $ 125,678,000 | $ 14,912,000 | $ 30,010,000
Net (income) loss from discontinued operations | (92,423,000) | 2,871,000 | (10,229,000)
Net cash provided by (used in) operating activities | 66,446,000 | 49,151,000 | 80,118,000
CASH FLOWS FROM INVESTING ACTIVITIES - CONTINUING OPERATIONS: |  |  |
Acquisition of property, plant and equipment | (50,138,000) | (34,937,000) | (59,276,000)
Acquired business, net of cash acquired | (430,932,000) | (34,719,000) | (4,470,000)
Intercompany distributions | 0 |  | 4,470,000
Proceeds from Divestiture of Businesses | 474,727,000 | 0 | 0
Proceeds from sale of property, plant and equipment | 663,000 | 143,000 | 770,000
Investment purchases | 0 | 1,824,000 | (715,000)
Net cash used in investing activities - continuing operations | (5,680,000) | (71,337,000) | (62,261,000)
CASH FLOWS FROM FINANCING ACTIVITIES - CONTINUING OPERATIONS: |  |  |
Proceeds from issuance of common stock | 0 | 0 | 0
Purchase of shares for treasury | (45,605,000) | (15,841,000) | (65,307,000)
Proceeds from long-term debt | 443,058,000 | 233,443,000 | 302,362,000
Payments of long-term debt | (300,993,000) | (170,454,000) | (208,514,000)
Share premium payment on settled debt | 0 | (24,997,000) | 0
Change in short-term borrowings | 144,000 | 0 | 0
Financing costs | (7,793,000) | (1,548,000) | (4,384,000)
Purchase of ESOP shares | 0 | (10,908,000) | 0
Tax effect from exercise/vesting of equity awards, net | 0 |  | 0
Dividends | (49,797,000) | (10,325,000) | (8,798,000)
Other, net | 51,000 | (70,000) | 55,000
Net cash provided by (used) in financing activities - continuing operations | 39,065,000 | (700,000) | 15,414,000
CASH FLOWS FROM DISCONTINUED OPERATIONS: |  |  |
Net cash used in discontinued operations | (78,927,000) | (2,150,000) | (13,605,000)
Effect of exchange rate changes on cash and equivalents | 1,173,000 | 164,000 | 886,000
NET INCREASE (DECREASE) IN CASH AND EQUIVALENTS | 22,077,000 | (24,872,000) | 20,552,000
CASH AND EQUIVALENTS AT BEGINNING OF PERIOD | 47,681,000 | 72,553,000 | 52,001,000
CASH AND EQUIVALENTS AT END OF PERIOD | 69,758,000 | 47,681,000 | 72,553,000
Parent Company [Member] |  |  |
CASH FLOWS FROM OPERATING ACTIVITIES: |  |  |
Net income | 125,678,000 | 14,912,000 | 30,010,000
Net (income) loss from discontinued operations | 0 | 0 | 0
Net cash provided by (used in) operating activities | 389,671,000 | (10,771,000) | (11,879,000)
CASH FLOWS FROM INVESTING ACTIVITIES - CONTINUING OPERATIONS: |  |  |
Acquisition of property, plant and equipment | (544,000) | (15,000) | (259,000)
Acquired business, net of cash acquired | (368,936,000) | 0 |
Intercompany distributions | 0 |  | 0
Proceeds from Divestiture of Businesses | 0 |  |
Proceeds from sale of property, plant and equipment | 0 | 0 | 0
Investment purchases |  | 1,824,000 | (715,000)
Net cash used in investing activities - continuing operations | (369,480,000) | (1,839,000) | 456,000
CASH FLOWS FROM FINANCING ACTIVITIES - CONTINUING OPERATIONS: |  |  |
Proceeds from issuance of common stock | 0 |  |
Purchase of shares for treasury | (45,605,000) | (15,841,000) | (65,307,000)
Proceeds from long-term debt | 411,623,000 | 201,124,000 | 271,340,000
Payments of long-term debt | (269,478,000) | (149,109,000) | (177,513,000)
Share premium payment on settled debt |  | (24,997,000) |
Change in short-term borrowings | 0 | 0 | 0
Financing costs | (7,793,000) | (1,548,000) | (4,277,000)
Purchase of ESOP shares |  | (10,908,000) |
Tax effect from exercise/vesting of equity awards, net | 0 |  | 0
Dividends | (49,797,000) | (10,325,000) | (8,798,000)
Other, net | (46,405,000) | 20,937,000 | 55,000
Net cash provided by (used) in financing activities - continuing operations | (7,455,000) | 9,333,000 | 15,500,000
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 INCREASE (DECREASE) IN CASH AND EQUIVALENTS | 12,736,000 | (3,277,000) | 4,077,000
CASH AND EQUIVALENTS AT BEGINNING OF PERIOD | 3,240,000 | 6,517,000 | 2,440,000
CASH AND EQUIVALENTS AT END OF PERIOD | 15,976,000 | 3,240,000 | 6,517,000
Guarantor Subsidiaries [Member] |  |  |
CASH FLOWS FROM OPERATING ACTIVITIES: |  |  |
Net income | 122,687,000 | 24,889,000 | 51,099,000
Net (income) loss from discontinued operations | (92,423,000) | (12,351,000) | (10,905,000)
Net cash provided by (used in) operating activities | (405,174,000) | 56,320,000 | 87,252,000
CASH FLOWS FROM INVESTING ACTIVITIES - CONTINUING OPERATIONS: |  |  |
Acquisition of property, plant and equipment | (41,531,000) | (27,902,000) | (62,176,000)
Acquired business, net of cash acquired | (4,843,000) | 0 |
Intercompany distributions | 0 |  | 2,726,000
Proceeds from Divestiture of Businesses | 474,727,000 |  |
Proceeds from sale of property, plant and equipment | 62,000 | 144,000 | 763,000
Investment purchases |  | 0 | 0
Net cash used in investing activities - continuing operations | 428,415,000 | (27,758,000) | (64,139,000)
CASH FLOWS FROM FINANCING ACTIVITIES - CONTINUING OPERATIONS: |  |  |
Proceeds from issuance of common stock | 0 |  |
Purchase of shares for treasury | 0 | 0 | 0
Proceeds from long-term debt | 2,125,000 | 0 | 2,311,000
Payments of long-term debt | (5,403,000) | (1,282,000) | (1,237,000)
Share premium payment on settled debt |  | 0 |
Change in short-term borrowings | 144,000 | 0 | 0
Financing costs | 0 | 0 | 0
Purchase of ESOP shares |  | 0 |
Tax effect from exercise/vesting of equity awards, net | 0 |  | 0
Dividends | 0 | 0 | 0
Other, net | 4,733,000 | (34,806,000) | (1,926,000)
Net cash provided by (used) in financing activities - continuing operations | 1,599,000 | (36,088,000) | (852,000)
CASH FLOWS FROM DISCONTINUED OPERATIONS: |  |  |
Net cash used in discontinued operations | (16,394,000) | (12,100,000) | (5,241,000)
Effect of exchange rate changes on cash and equivalents | (159,000) | 0 | 0
NET INCREASE (DECREASE) IN CASH AND EQUIVALENTS | 8,287,000 | (19,626,000) | 17,020,000
CASH AND EQUIVALENTS AT BEGINNING OF PERIOD | 8,066,000 | 27,692,000 | 10,672,000
CASH AND EQUIVALENTS AT END OF PERIOD | 16,353,000 | 8,066,000 | 27,692,000
Non-Guarantor Subsidiaries [Member] |  |  |
CASH FLOWS FROM OPERATING ACTIVITIES: |  |  |
Net income | 84,680,000 | 47,242,000 | 62,708,000
Net (income) loss from discontinued operations | 0 | 15,222,000 | 676,000
Net cash provided by (used in) operating activities | 108,981,000 | 3,602,000 | 4,745,000
CASH FLOWS FROM INVESTING ACTIVITIES - CONTINUING OPERATIONS: |  |  |
Acquisition of property, plant and equipment | (8,063,000) | (7,020,000) | 3,159,000
Acquired business, net of cash acquired | (57,153,000) | (34,719,000) |
Intercompany distributions | 0 |  | 1,744,000
Proceeds from Divestiture of Businesses | 0 |  |
Proceeds from sale of property, plant and equipment | 601,000 | (1,000) | 7,000
Investment purchases |  | 0 | 0
Net cash used in investing activities - continuing operations | (64,615,000) | (41,740,000) | 1,422,000
CASH FLOWS FROM FINANCING ACTIVITIES - CONTINUING OPERATIONS: |  |  |
Proceeds from issuance of common stock | 0 |  |
Purchase of shares for treasury | 0 | 0 | 0
Proceeds from long-term debt | 29,310,000 | 32,319,000 | 28,711,000
Payments of long-term debt | (26,112,000) | (20,063,000) | (29,764,000)
Share premium payment on settled debt |  | 0 |
Change in short-term borrowings | 0 | 0 | 0
Financing costs | 0 | 0 | (107,000)
Purchase of ESOP shares |  | 0 |
Tax effect from exercise/vesting of equity awards, net | 0 |  | 0
Dividends | 0 | 0 | 0
Other, net | 14,691,000 | 13,799,000 | 1,926,000
Net cash provided by (used) in financing activities - continuing operations | 17,889,000 | 26,055,000 | 766,000
CASH FLOWS FROM DISCONTINUED OPERATIONS: |  |  |
Net cash used in discontinued operations | (62,533,000) | 9,950,000 | (8,364,000)
Effect of exchange rate changes on cash and equivalents | 1,332,000 | 164,000 | 886,000
NET INCREASE (DECREASE) IN CASH AND EQUIVALENTS | 1,054,000 | (1,969,000) | (545,000)
CASH AND EQUIVALENTS AT BEGINNING OF PERIOD | 36,375,000 | 38,344,000 | 38,889,000
CASH AND EQUIVALENTS AT END OF PERIOD | 37,429,000 | 36,375,000 | 38,344,000
Consolidation, Eliminations [Member] |  |  |
CASH FLOWS FROM OPERATING ACTIVITIES: |  |  |
Net income | (207,367,000) | (72,131,000) | (113,807,000)
Net (income) loss from discontinued operations | 0 | 0 | 0
Net cash provided by (used in) operating activities | (27,032,000) | 0 | 0
CASH FLOWS FROM INVESTING ACTIVITIES - CONTINUING OPERATIONS: |  |  |
Acquisition of property, plant and equipment | 0 | 0 | 0
Acquired business, net of cash acquired | 0 | 0 |
Intercompany distributions | 0 |  | 0
Proceeds from Divestiture of Businesses | 0 |  |
Proceeds from sale of property, plant and equipment | 0 | 0 | 0
Investment purchases |  | 0 | 0
Net cash used in investing activities - continuing operations | 0 | 0 | 0
CASH FLOWS FROM FINANCING ACTIVITIES - CONTINUING OPERATIONS: |  |  |
Proceeds from issuance of common stock | 0 |  |
Purchase of shares for treasury | 0 | 0 | 0
Proceeds from long-term debt | 0 | 0 | 0
Payments of long-term debt | 0 | 0 | 0
Share premium payment on settled debt |  | 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
Dividends | 0 | 0 | 0
Other, net | 27,032,000 | 0 | 0
Net cash provided by (used) in financing activities - continuing operations | 27,032,000 | 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 INCREASE (DECREASE) IN CASH AND EQUIVALENTS | 0 | 0 | 0
CASH AND EQUIVALENTS AT BEGINNING OF PERIOD | 0 | 0 | 0
CASH AND EQUIVALENTS AT END OF PERIOD | $ 0 | $ 0 | $ 0

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- Definition Amount of cash outflow in the form of ordinary dividends to common shareholders of the parent entity. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3291-108585 + Details
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- Definition The cash outflow for loan and debt issuance costs. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3291-108585 + Details
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- Definition The cash outflow associated with the acquisition of a business, net of the cash acquired from the purchase. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3213-108585 + Details
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