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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, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2015 | Sep. 30, 2014 | Sep. 30, 2013
CASH FLOWS FROM OPERATING ACTIVITIES: |  |  |  |  |  |  |  |  |  |  |
Net income (loss) | $ 10,803 | $ 10,893 | $ 5,122 | $ 7,471 | $ 7,948 | $ 14,464 | $ (25,825) | $ 3,236 | $ 34,289 | $ (177) | $ 3,767
Net cash provided by (used in) operating activities |  |  |  |  |  |  |  |  | 76,137 | 93,301 | 85,683
CASH FLOWS FROM INVESTING ACTIVITIES: |  |  |  |  |  |  |  |  |  |  |
Acquisition of property, plant and equipment |  |  |  |  |  |  |  |  | (73,620) | (77,094) | (64,441)
Acquired business, net of cash acquired |  |  |  |  |  |  |  |  | (2,225) | (62,306) | 0
Intercompany distributions |  |  |  |  |  |  |  |  | 0 | 0 | 0
Proceeds from Sale of Available-for-sale Securities, Equity |  |  |  |  |  |  |  |  | 8,891 |  |
Purchase of securities |  |  |  |  |  |  |  |  | (8,891) | 8,402 | 0
Proceeds from sale of property, plant and equipment |  |  |  |  |  |  |  |  | 334 | 552 | 1,573
Net cash used in investing activities |  |  |  |  |  |  |  |  | (66,620) | (147,250) | (62,868)
CASH FLOWS FROM FINANCING ACTIVITIES: |  |  |  |  |  |  |  |  |  |  |
Proceeds from issuance of common stock |  |  |  |  |  |  |  |  | 371 | 584 | 0
Purchase of shares for treasury |  |  |  |  |  |  |  |  | (82,343) | (79,614) | (32,521)
Proceeds from issuance of debt |  |  |  |  |  |  |  |  | 233,491 | 691,943 | 303
Payments of long-term debt |  |  |  |  |  |  |  |  | (187,735) | (603,094) | (16,867)
Change in short-term borrowings |  |  |  |  |  |  |  |  | (365) | (749) | 2,950
Financing costs |  |  |  |  |  |  |  |  | (1,308) | (11,298) | (833)
Purchase of ESOP shares |  |  |  |  |  |  |  |  | 0 | (20,000) | 0
Tax effect from exercise/vesting of equity awards, net |  |  |  |  |  |  |  |  | 345 | 273 | 150
Dividend |  |  |  |  |  |  |  |  | 7,654 | 6,273 | 5,825
Other, net |  |  |  |  |  |  |  |  | 347 | 298 | 394
Net cash used in financing activities |  |  |  |  |  |  |  |  | (44,851) | (27,930) | (52,249)
CASH FLOWS FROM DISCONTINUED OPERATIONS: |  |  |  |  |  |  |  |  |  |  |
Net cash used in discontinued operations |  |  |  |  |  |  |  |  | (918) | (1,528) | (2,090)
Effect of exchange rate changes on cash and equivalents |  |  |  |  |  |  |  |  | (4,152) | (2,318) | 0
NET DECREASE IN CASH AND EQUIVALENTS |  |  |  |  |  |  |  |  | (40,404) | (85,725) | (31,524)
CASH AND EQUIVALENTS AT BEGINNING OF PERIOD |  |  |  | 92,405 |  |  |  | 178,130 | 92,405 | 178,130 | 209,654
CASH AND EQUIVALENTS AT END OF PERIOD | 52,001 |  |  |  | 92,405 |  |  |  | 52,001 | 92,405 | 178,130
Parent Company [Member] |  |  |  |  |  |  |  |  |  |  |
CASH FLOWS FROM OPERATING ACTIVITIES: |  |  |  |  |  |  |  |  |  |  |
Net income (loss) |  |  |  |  |  |  |  |  | 34,289 | (177) | 3,767
Net cash provided by (used in) operating activities |  |  |  |  |  |  |  |  | 58,760 | (3,902) | (25,184)
CASH FLOWS FROM INVESTING ACTIVITIES: |  |  |  |  |  |  |  |  |  |  |
Acquisition of property, plant and equipment |  |  |  |  |  |  |  |  | (274) | (700) | (123)
Acquired business, net of cash acquired |  |  |  |  |  |  |  |  | 0 | 0 |
Intercompany distributions |  |  |  |  |  |  |  |  | 10,000 | 10,000 | 10,000
Proceeds from Sale of Available-for-sale Securities, Equity |  |  |  |  |  |  |  |  | 8,891 |  |
Purchase of securities |  |  |  |  |  |  |  |  |  | 8,402 |
Proceeds from sale of property, plant and equipment |  |  |  |  |  |  |  |  | 0 | 0 | 0
Net cash used in investing activities |  |  |  |  |  |  |  |  | 18,617 | 898 | 9,877
CASH FLOWS FROM FINANCING ACTIVITIES: |  |  |  |  |  |  |  |  |  |  |
Proceeds from issuance of common stock |  |  |  |  |  |  |  |  | 371 | 584 |
Purchase of shares for treasury |  |  |  |  |  |  |  |  | (82,343) | (79,614) | (32,521)
Proceeds from issuance of debt |  |  |  |  |  |  |  |  | 124,500 | 659,568 | 0
Payments of long-term debt |  |  |  |  |  |  |  |  | (116,702) | (598,250) | (2,157)
Change in short-term borrowings |  |  |  |  |  |  |  |  | 0 | 0 | 0
Financing costs |  |  |  |  |  |  |  |  | (614) | (10,763) | (833)
Purchase of ESOP shares |  |  |  |  |  |  |  |  |  | (20,000) |
Tax effect from exercise/vesting of equity awards, net |  |  |  |  |  |  |  |  | 345 | 273 | 150
Dividend |  |  |  |  |  |  |  |  | 7,654 | 11,273 | 5,825
Other, net |  |  |  |  |  |  |  |  | 347 | 298 | 394
Net cash used in financing activities |  |  |  |  |  |  |  |  | (81,750) | (59,177) | (40,792)
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 |  |  |  |  |  |  |  |  | (4,373) | (62,181) | (56,099)
CASH AND EQUIVALENTS AT BEGINNING OF PERIOD |  |  |  | 6,813 |  |  |  | 68,994 | 6,813 | 68,994 | 125,093
CASH AND EQUIVALENTS AT END OF PERIOD | 2,440 |  |  |  | 6,813 |  |  |  | 2,440 | 6,813 | 68,994
Guarantor Subsidiaries [Member] |  |  |  |  |  |  |  |  |  |  |
CASH FLOWS FROM OPERATING ACTIVITIES: |  |  |  |  |  |  |  |  |  |  |
Net income (loss) |  |  |  |  |  |  |  |  | 55,938 | 40,612 | 33,301
Net cash provided by (used in) operating activities |  |  |  |  |  |  |  |  | 27,130 | 17,168 | 83,177
CASH FLOWS FROM INVESTING ACTIVITIES: |  |  |  |  |  |  |  |  |  |  |
Acquisition of property, plant and equipment |  |  |  |  |  |  |  |  | (54,196) | (64,320) | (56,617)
Acquired business, net of cash acquired |  |  |  |  |  |  |  |  | (2,225) | 2,675 |
Intercompany distributions |  |  |  |  |  |  |  |  | (10,000) | (10,000) | (10,000)
Proceeds from Sale of Available-for-sale Securities, Equity |  |  |  |  |  |  |  |  | 0 |  |
Purchase of securities |  |  |  |  |  |  |  |  |  | 0 |
Proceeds from sale of property, plant and equipment |  |  |  |  |  |  |  |  | 142 | 360 | 1,404
Net cash used in investing activities |  |  |  |  |  |  |  |  | (66,279) | (71,285) | (65,213)
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 |  |  |  |  |  |  |  |  | 13,596 | (102) | 303
Payments of long-term debt |  |  |  |  |  |  |  |  | (1,263) | (1,135) | (1,032)
Change in short-term borrowings |  |  |  |  |  |  |  |  | 0 | 0 | 0
Financing costs |  |  |  |  |  |  |  |  | (196) | 0 | 0
Purchase of ESOP shares |  |  |  |  |  |  |  |  |  | 0 |
Tax effect from exercise/vesting of equity awards, net |  |  |  |  |  |  |  |  | 0 | 0 | 0
Dividend |  |  |  |  |  |  |  |  | 0 | 5,000 | 0
Other, net |  |  |  |  |  |  |  |  | 6,161 | 56,533 | (26,674)
Net cash used in financing activities |  |  |  |  |  |  |  |  | 18,298 | 60,296 | (27,403)
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 |  |  |  |  |  |  |  |  | (20,851) | 6,179 | (9,439)
CASH AND EQUIVALENTS AT BEGINNING OF PERIOD |  |  |  | 31,522 |  |  |  | 25,343 | 31,522 | 25,343 | 34,782
CASH AND EQUIVALENTS AT END OF PERIOD | 10,671 |  |  |  | 31,522 |  |  |  | 10,671 | 31,522 | 25,343
Non-Guarantor Subsidiaries [Member] |  |  |  |  |  |  |  |  |  |  |
CASH FLOWS FROM OPERATING ACTIVITIES: |  |  |  |  |  |  |  |  |  |  |
Net income (loss) |  |  |  |  |  |  |  |  | 54,188 | 40,721 | 26,939
Net cash provided by (used in) operating activities |  |  |  |  |  |  |  |  | (9,753) | 80,035 | 27,690
CASH FLOWS FROM INVESTING ACTIVITIES: |  |  |  |  |  |  |  |  |  |  |
Acquisition of property, plant and equipment |  |  |  |  |  |  |  |  | (19,150) | (12,074) | (7,701)
Acquired business, net of cash acquired |  |  |  |  |  |  |  |  | 0 | (64,981) |
Intercompany distributions |  |  |  |  |  |  |  |  | 0 | 0 | 0
Proceeds from Sale of Available-for-sale Securities, Equity |  |  |  |  |  |  |  |  | 0 |  |
Purchase of securities |  |  |  |  |  |  |  |  |  | 0 |
Proceeds from sale of property, plant and equipment |  |  |  |  |  |  |  |  | 192 | 192 | 169
Net cash used in investing activities |  |  |  |  |  |  |  |  | (18,958) | (76,863) | (7,532)
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 | 0
Payments of long-term debt |  |  |  |  |  |  |  |  | (69,770) | (3,709) | (13,678)
Change in short-term borrowings |  |  |  |  |  |  |  |  | (365) | (749) | 2,950
Financing costs |  |  |  |  |  |  |  |  | (498) | (535) | 0
Purchase of ESOP shares |  |  |  |  |  |  |  |  |  | 0 |
Tax effect from exercise/vesting of equity awards, net |  |  |  |  |  |  |  |  | 0 | 0 | 0
Dividend |  |  |  |  |  |  |  |  | 0 | 0 | 0
Other, net |  |  |  |  |  |  |  |  | (6,161) | (56,533) | 26,674
Net cash used in financing activities |  |  |  |  |  |  |  |  | 18,601 | (29,049) | 15,946
CASH FLOWS FROM DISCONTINUED OPERATIONS: |  |  |  |  |  |  |  |  |  |  |
Net cash used in discontinued operations |  |  |  |  |  |  |  |  | (918) | (1,528) | (2,090)
Effect of exchange rate changes on cash and equivalents |  |  |  |  |  |  |  |  | (4,152) | (2,318) | 0
NET DECREASE IN CASH AND EQUIVALENTS |  |  |  |  |  |  |  |  | (15,180) | (29,723) | 34,014
CASH AND EQUIVALENTS AT BEGINNING OF PERIOD |  |  |  | 54,070 |  |  |  | 83,793 | 54,070 | 83,793 | 49,779
CASH AND EQUIVALENTS AT END OF PERIOD | 38,890 |  |  |  | 54,070 |  |  |  | 38,890 | 54,070 | 83,793
Elimination [Member] |  |  |  |  |  |  |  |  |  |  |
CASH FLOWS FROM OPERATING ACTIVITIES: |  |  |  |  |  |  |  |  |  |  |
Net income (loss) |  |  |  |  |  |  |  |  | (110,126) | (81,333) | (60,240)
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
Proceeds from Sale of Available-for-sale Securities, Equity |  |  |  |  |  |  |  |  | 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 | 0 |
Purchase of shares for treasury |  |  |  |  |  |  |  |  | 0 | 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 | 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 | 0
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

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