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CONSOLIDATING GUARANTOR AND NON-GUARANTOR FINANCIAL INFORMATION (Details) - Summary of consolidated cash flows - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2014 | Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2014
CASH FLOWS FROM OPERATING ACTIVITIES: |  |  |  |  |  |  |  |  |  |  |
Net income (loss) | $ 7,723 | $ 7,596 | $ 6,095 | $ 8,596 | $ 10,803 | $ 10,893 | $ 5,122 | $ 7,471 | $ 30,010 | $ 34,289 | $ (177)
Net cash provided by (used in) operating activities |  |  |  |  |  |  |  |  | 105,937 | 76,137 | 93,301
CASH FLOWS FROM INVESTING ACTIVITIES: |  |  |  |  |  |  |  |  |  |  |
Acquisition of property, plant and equipment |  |  |  |  |  |  |  |  | (90,759) | (73,620) | (77,094)
Acquired business, net of cash acquired |  |  |  |  |  |  |  |  | (4,470) | (2,225) | (62,306)
Intercompany distributions |  |  |  |  |  |  |  |  |  | 0 | 0
Investment sales (purchases) |  |  |  |  |  |  |  |  | 715 | 8,891 | (8,402)
Proceeds from sale of property, plant and equipment |  |  |  |  |  |  |  |  | 909 | 334 | 552
Net cash used in investing activities |  |  |  |  |  |  |  |  | (93,605) | (66,620) | (147,250)
CASH FLOWS FROM FINANCING ACTIVITIES: |  |  |  |  |  |  |  |  |  |  |
Proceeds from issuance of common stock |  |  |  |  |  |  |  |  | 0 | 371 | 584
Purchase of shares for treasury |  |  |  |  |  |  |  |  | (65,307) | (82,343) | (79,614)
Proceeds from issuance of debt |  |  |  |  |  |  |  |  | 302,362 | 233,491 | 691,943
Payments of long-term debt |  |  |  |  |  |  |  |  | (214,986) | (187,735) | (603,094)
Change in short-term borrowings |  |  |  |  |  |  |  |  | (54) | (365) | (749)
Financing costs |  |  |  |  |  |  |  |  | (4,384) | (1,308) | (11,298)
Purchase of ESOP shares |  |  |  |  |  |  |  |  | 0 | 0 | (20,000)
Tax effect from exercise/vesting of equity awards, net |  |  |  |  |  |  |  |  | 0 | 345 | 273
Dividends |  |  |  |  |  |  |  |  | (8,798) | (7,654) | (6,273)
Other, net |  |  |  |  |  |  |  |  | 55 | 347 | 298
Net cash used in financing activities |  |  |  |  |  |  |  |  | 8,888 | (44,851) | (27,930)
CASH FLOWS FROM DISCONTINUED OPERATIONS: |  |  |  |  |  |  |  |  |  |  |
Net cash used in discontinued operations |  |  |  |  |  |  |  |  | (1,554) | (918) | (1,528)
Effect of exchange rate changes on cash and equivalents |  |  |  |  |  |  |  |  | 886 | (4,152) | (2,318)
NET INCREASE (DECREASE) IN CASH AND EQUIVALENTS |  |  |  |  |  |  |  |  | 20,552 | (40,404) | (85,725)
CASH AND EQUIVALENTS AT BEGINNING OF PERIOD |  |  |  | 52,001 |  |  |  | 92,405 | 52,001 | 92,405 | 178,130
CASH AND EQUIVALENTS AT END OF PERIOD | 72,553 |  |  |  | 52,001 |  |  |  | 72,553 | 52,001 | 92,405
Parent Company [Member] |  |  |  |  |  |  |  |  |  |  |
CASH FLOWS FROM OPERATING ACTIVITIES: |  |  |  |  |  |  |  |  |  |  |
Net income (loss) |  |  |  |  |  |  |  |  | 30,010 | 34,289 | (177)
Net cash provided by (used in) operating activities |  |  |  |  |  |  |  |  | (11,879) | 58,760 | (3,902)
CASH FLOWS FROM INVESTING ACTIVITIES: |  |  |  |  |  |  |  |  |  |  |
Acquisition of property, plant and equipment |  |  |  |  |  |  |  |  |  | (274) | (700)
Acquired business, net of cash acquired |  |  |  |  |  |  |  |  |  | 0 | 0
Intercompany distributions |  |  |  |  |  |  |  |  |  | 10,000 | 10,000
Investment sales (purchases) |  |  |  |  |  |  |  |  | 715 | 8,891 | (8,402)
Proceeds from sale of property, plant and equipment |  |  |  |  |  |  |  |  |  | 0 | 0
Net cash used in investing activities |  |  |  |  |  |  |  |  |  | 18,617 | 898
CASH FLOWS FROM FINANCING ACTIVITIES: |  |  |  |  |  |  |  |  |  |  |
Proceeds from issuance of common stock |  |  |  |  |  |  |  |  |  | 371 | 584
Purchase of shares for treasury |  |  |  |  |  |  |  |  |  | (82,343) | (79,614)
Proceeds from issuance of debt |  |  |  |  |  |  |  |  |  | 124,500 | 659,568
Payments of long-term debt |  |  |  |  |  |  |  |  |  | (116,702) | (598,250)
Change in short-term borrowings |  |  |  |  |  |  |  |  | 0 | 0 | 0
Financing costs |  |  |  |  |  |  |  |  | (4,277) | (614) | (10,763)
Purchase of ESOP shares |  |  |  |  |  |  |  |  |  |  | (20,000)
Tax effect from exercise/vesting of equity awards, net |  |  |  |  |  |  |  |  |  | 345 | 273
Dividends |  |  |  |  |  |  |  |  |  | (7,654) | (11,273)
Other, net |  |  |  |  |  |  |  |  |  | 347 | 298
Net cash used in financing activities |  |  |  |  |  |  |  |  |  | (81,750) | (59,177)
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 |  |  |  |  |  |  |  |  |  | (4,373) | (62,181)
CASH AND EQUIVALENTS AT BEGINNING OF PERIOD |  |  |  | 2,440 |  |  |  | 6,813 | 2,440 | 6,813 | 68,994
CASH AND EQUIVALENTS AT END OF PERIOD | 6,517 |  |  |  | 2,440 |  |  |  | 6,517 | 2,440 | 6,813
Guarantor Subsidiaries [Member] |  |  |  |  |  |  |  |  |  |  |
CASH FLOWS FROM OPERATING ACTIVITIES: |  |  |  |  |  |  |  |  |  |  |
Net income (loss) |  |  |  |  |  |  |  |  | 50,571 | 55,938 | 40,612
Net cash provided by (used in) operating activities |  |  |  |  |  |  |  |  |  | 27,130 | 17,168
CASH FLOWS FROM INVESTING ACTIVITIES: |  |  |  |  |  |  |  |  |  |  |
Acquisition of property, plant and equipment |  |  |  |  |  |  |  |  | (78,159) | (54,196) | (64,320)
Acquired business, net of cash acquired |  |  |  |  |  |  |  |  |  | (2,225) | 2,675
Intercompany distributions |  |  |  |  |  |  |  |  |  | (10,000) | (10,000)
Investment sales (purchases) |  |  |  |  |  |  |  |  | 0 | 0 | 0
Proceeds from sale of property, plant and equipment |  |  |  |  |  |  |  |  | 765 | 142 | 360
Net cash used in investing activities |  |  |  |  |  |  |  |  |  | (66,279) | (71,285)
CASH FLOWS FROM FINANCING ACTIVITIES: |  |  |  |  |  |  |  |  |  |  |
Proceeds from issuance of common stock |  |  |  |  |  |  |  |  |  | 0 | 0
Purchase of shares for treasury |  |  |  |  |  |  |  |  |  | 0 | 0
Proceeds from issuance of debt |  |  |  |  |  |  |  |  |  | 13,596 | (102)
Payments of long-term debt |  |  |  |  |  |  |  |  |  | (1,263) | (1,135)
Change in short-term borrowings |  |  |  |  |  |  |  |  |  | 0 | 0
Financing costs |  |  |  |  |  |  |  |  |  | (196) | 0
Purchase of ESOP shares |  |  |  |  |  |  |  |  |  |  | 0
Tax effect from exercise/vesting of equity awards, net |  |  |  |  |  |  |  |  |  | 0 | 0
Dividends |  |  |  |  |  |  |  |  |  | 0 | 5,000
Other, net |  |  |  |  |  |  |  |  |  | 6,161 | 56,533
Net cash used in financing activities |  |  |  |  |  |  |  |  |  | 18,298 | 60,296
CASH FLOWS FROM DISCONTINUED OPERATIONS: |  |  |  |  |  |  |  |  |  |  |
Net cash used in discontinued operations |  |  |  |  |  |  |  |  |  | 0 | 0
Effect of exchange rate changes on cash and equivalents |  |  |  |  |  |  |  |  | 0 | 0 | 0
NET INCREASE (DECREASE) IN CASH AND EQUIVALENTS |  |  |  |  |  |  |  |  | 17,021 | (20,851) | 6,179
CASH AND EQUIVALENTS AT BEGINNING OF PERIOD |  |  |  | 10,671 |  |  |  | 31,522 | 10,671 | 31,522 | 25,343
CASH AND EQUIVALENTS AT END OF PERIOD | 27,692 |  |  |  | 10,671 |  |  |  | 27,692 | 10,671 | 31,522
Non-Guarantor Subsidiaries [Member] |  |  |  |  |  |  |  |  |  |  |
CASH FLOWS FROM OPERATING ACTIVITIES: |  |  |  |  |  |  |  |  |  |  |
Net income (loss) |  |  |  |  |  |  |  |  | 52,316 | 54,188 | 40,721
Net cash provided by (used in) operating activities |  |  |  |  |  |  |  |  |  | (9,753) | 80,035
CASH FLOWS FROM INVESTING ACTIVITIES: |  |  |  |  |  |  |  |  |  |  |
Acquisition of property, plant and equipment |  |  |  |  |  |  |  |  |  | (19,150) | (12,074)
Acquired business, net of cash acquired |  |  |  |  |  |  |  |  |  | 0 | (64,981)
Intercompany distributions |  |  |  |  |  |  |  |  |  | 0 | 0
Investment sales (purchases) |  |  |  |  |  |  |  |  | 0 | 0 | 0
Proceeds from sale of property, plant and equipment |  |  |  |  |  |  |  |  |  | 192 | 192
Net cash used in investing activities |  |  |  |  |  |  |  |  | (13,941) | (18,958) | (76,863)
CASH FLOWS FROM FINANCING ACTIVITIES: |  |  |  |  |  |  |  |  |  |  |
Proceeds from issuance of common stock |  |  |  |  |  |  |  |  |  | 0 | 0
Purchase of shares for treasury |  |  |  |  |  |  |  |  | 0 | 0 | 0
Proceeds from issuance of debt |  |  |  |  |  |  |  |  |  | 95,395 | 32,477
Payments of long-term debt |  |  |  |  |  |  |  |  | (35,338) | (69,770) | (3,709)
Change in short-term borrowings |  |  |  |  |  |  |  |  | (54) | (365) | (749)
Financing costs |  |  |  |  |  |  |  |  |  | (498) | (535)
Purchase of ESOP shares |  |  |  |  |  |  |  |  |  |  | 0
Tax effect from exercise/vesting of equity awards, net |  |  |  |  |  |  |  |  |  | 0 | 0
Dividends |  |  |  |  |  |  |  |  | 0 | 0 | 0
Other, net |  |  |  |  |  |  |  |  |  | (6,161) | (56,533)
Net cash used in financing activities |  |  |  |  |  |  |  |  | (4,862) | 18,601 | (29,049)
CASH FLOWS FROM DISCONTINUED OPERATIONS: |  |  |  |  |  |  |  |  |  |  |
Net cash used in discontinued operations |  |  |  |  |  |  |  |  |  | (918) | (1,528)
Effect of exchange rate changes on cash and equivalents |  |  |  |  |  |  |  |  |  | (4,152) | (2,318)
NET INCREASE (DECREASE) IN CASH AND EQUIVALENTS |  |  |  |  |  |  |  |  | (546) | (15,180) | (29,723)
CASH AND EQUIVALENTS AT BEGINNING OF PERIOD |  |  |  | 38,890 |  |  |  | 54,070 | 38,890 | 54,070 | 83,793
CASH AND EQUIVALENTS AT END OF PERIOD | 38,344 |  |  |  | 38,890 |  |  |  | 38,344 | 38,890 | 54,070
Consolidation, Eliminations [Member] |  |  |  |  |  |  |  |  |  |  |
CASH FLOWS FROM OPERATING ACTIVITIES: |  |  |  |  |  |  |  |  |  |  |
Net income (loss) |  |  |  |  |  |  |  |  | (102,887) | (110,126) | (81,333)
Net cash provided by (used in) operating activities |  |  |  |  |  |  |  |  |  | 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
Investment sales (purchases) |  |  |  |  |  |  |  |  | 0 | 0 | 0
Proceeds from sale of property, plant and equipment |  |  |  |  |  |  |  |  |  | 0 | 0
Net cash used in investing activities |  |  |  |  |  |  |  |  | 0 | 0 | 0
CASH FLOWS FROM FINANCING ACTIVITIES: |  |  |  |  |  |  |  |  |  |  |
Proceeds from issuance of common stock |  |  |  |  |  |  |  |  |  | 0 | 0
Purchase of shares for treasury |  |  |  |  |  |  |  |  |  | 0 | 0
Proceeds from issuance of debt |  |  |  |  |  |  |  |  | 0 | 0 | 0
Payments of long-term debt |  |  |  |  |  |  |  |  | 0 | 0 | 0
Change in short-term borrowings |  |  |  |  |  |  |  |  | 0 | 0 | 0
Financing costs |  |  |  |  |  |  |  |  |  | 0 | 0
Purchase of ESOP shares |  |  |  |  |  |  |  |  |  |  | 0
Tax effect from exercise/vesting of equity awards, net |  |  |  |  |  |  |  |  |  | 0 | 0
Dividends |  |  |  |  |  |  |  |  |  | 0 | 0
Other, net |  |  |  |  |  |  |  |  |  | 0 | 0
Net cash used in financing activities |  |  |  |  |  |  |  |  |  | 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
NET INCREASE (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

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