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CONSOLIDATING GUARANTOR AND NON-GUARANTOR FINANCIAL INFORMATION (Details) - Summary of consolidated statement of operations and comprehensive income - 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
Condensed Income Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue | $ 502,158 | $ 511,694 | $ 500,020 | $ 502,160 | $ 525,627 | $ 505,039 | $ 507,687 | $ 453,458 | $ 2,016,032 | $ 1,991,811 | $ 1,871,327
Cost of goods and services |  |  |  |  |  |  |  |  | 1,540,254 | 1,532,412 | 1,453,742
Gross profit | 119,925 | 123,489 | 114,375 | 117,989 | 125,602 | 118,307 | 109,987 | 105,503 | 475,778 | 459,399 | 417,585
Selling, general and administrative expenses |  |  |  |  |  |  |  |  | 374,761 | 375,099 | 340,469
Restructuring and other related charges |  |  |  |  |  |  |  |  | 0 | 6,136 | 13,262
Total operating expenses |  |  |  |  |  |  |  |  | 374,761 | 381,235 | 353,731
Income from operations |  |  |  |  |  |  |  |  | 101,017 | 78,164 | 63,854
Other income (expense) |  |  |  |  |  |  |  |  |  |  |
Interest income (expense), net |  |  |  |  |  |  |  |  | (47,872) | (48,144) | (52,167)
Loss from debt extinguishment |  |  |  |  |  |  | 24,964 |  | 0 | (38,890) | 0
Other, net |  |  |  |  |  |  |  |  | 491 | 3,154 | 2,646
Total other income (expense) |  |  |  |  |  |  |  |  | (47,381) | (83,880) | (49,521)
Income (loss) before taxes |  |  |  |  |  |  |  |  | 53,636 | (5,716) | 14,333
Provision (benefit) for income taxes |  |  |  |  |  |  |  |  | 19,347 | (5,539) | 7,543
Income (loss) before equity in net income of subsidiaries |  |  |  |  |  |  |  |  | 34,289 | (177) | 6,790
Equity in net income (loss) of subsidiaries |  |  |  |  |  |  |  |  | 0 | 0 | 0
Income (loss) from continuing operations |  |  |  |  |  |  |  |  | 34,289 | (177) | 6,790
Loss from operations of discontinued businesses |  |  |  |  |  |  |  |  | 0 | 0 | (4,651)
Benefit from income taxes |  |  |  |  |  |  |  |  | 0 | 0 | 1,628
Loss from discontinued operations |  |  |  |  |  |  |  |  | 0 | 0 | (3,023)
Net income (loss) | $ 10,803 | $ 10,893 | $ 5,122 | $ 7,471 | $ 7,948 | $ 14,464 | $ (25,825) | $ 3,236 | 34,289 | (177) | 3,767
Other comprehensive income (loss), net of taxes |  |  |  |  |  |  |  |  | (61,124) | (26,725) | 16,220
Comprehensive income (loss) |  |  |  |  |  |  |  |  | (26,835) | (26,902) | 19,987
Parent Company [Member] |  |  |  |  |  |  |  |  |  |  |
Condensed Income Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 0 | 0 | 0
Cost of goods and services |  |  |  |  |  |  |  |  | 0 | 0 | 0
Gross profit |  |  |  |  |  |  |  |  | 0 | 0 | 0
Selling, general and administrative expenses |  |  |  |  |  |  |  |  | 22,637 | 24,084 | 24,248
Restructuring and other related charges |  |  |  |  |  |  |  |  | 0 | 0 | 0
Total operating expenses |  |  |  |  |  |  |  |  | 22,637 | 24,084 | 24,248
Income from operations |  |  |  |  |  |  |  |  | (22,637) | (24,084) | (24,248)
Other income (expense) |  |  |  |  |  |  |  |  |  |  |
Interest income (expense), net |  |  |  |  |  |  |  |  | (8,741) | (10,079) | (14,381)
Loss from debt extinguishment |  |  |  |  |  |  |  |  |  | (38,890) |
Other, net |  |  |  |  |  |  |  |  | 438 | 111 | 569
Total other income (expense) |  |  |  |  |  |  |  |  | (8,303) | (48,858) | (13,812)
Income (loss) before taxes |  |  |  |  |  |  |  |  | (30,940) | (72,942) | (38,060)
Provision (benefit) for income taxes |  |  |  |  |  |  |  |  | (11,041) | (32,044) | (14,888)
Income (loss) before equity in net income of subsidiaries |  |  |  |  |  |  |  |  | (19,899) | (40,898) | (23,172)
Equity in net income (loss) of subsidiaries |  |  |  |  |  |  |  |  | 54,188 | 40,721 | 26,939
Income (loss) from continuing operations |  |  |  |  |  |  |  |  | 34,289 | (177) | 3,767
Loss from operations of discontinued businesses |  |  |  |  |  |  |  |  | 0 | 0 | 0
Benefit from income taxes |  |  |  |  |  |  |  |  | 0 | 0 | 0
Loss from discontinued operations |  |  |  |  |  |  |  |  | 0 | 0 | 0
Net income (loss) |  |  |  |  |  |  |  |  | 34,289 | (177) | 3,767
Comprehensive income (loss) |  |  |  |  |  |  |  |  | (26,835) | (26,902) | 19,987
Guarantor Subsidiaries [Member] |  |  |  |  |  |  |  |  |  |  |
Condensed Income Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 1,581,295 | 1,526,678 | 1,459,705
Cost of goods and services |  |  |  |  |  |  |  |  | 1,204,872 | 1,156,268 | 1,107,440
Gross profit |  |  |  |  |  |  |  |  | 376,423 | 370,410 | 352,265
Selling, general and administrative expenses |  |  |  |  |  |  |  |  | 272,421 | 281,930 | 269,654
Restructuring and other related charges |  |  |  |  |  |  |  |  | 0 | 4,234 | 9,236
Total operating expenses |  |  |  |  |  |  |  |  | 272,421 | 286,164 | 278,890
Income from operations |  |  |  |  |  |  |  |  | 104,002 | 84,246 | 73,375
Other income (expense) |  |  |  |  |  |  |  |  |  |  |
Interest income (expense), net |  |  |  |  |  |  |  |  | (30,547) | (28,630) | (27,660)
Other, net |  |  |  |  |  |  |  |  | 10,521 | 7,945 | 9,656
Total other income (expense) |  |  |  |  |  |  |  |  | (20,026) | (20,685) | (18,004)
Income (loss) before taxes |  |  |  |  |  |  |  |  | 83,976 | 63,561 | 55,371
Provision (benefit) for income taxes |  |  |  |  |  |  |  |  | 31,100 | 26,480 | 20,603
Income (loss) before equity in net income of subsidiaries |  |  |  |  |  |  |  |  | 52,876 | 37,081 | 34,768
Equity in net income (loss) of subsidiaries |  |  |  |  |  |  |  |  | 3,062 | 3,531 | (1,467)
Income (loss) from continuing operations |  |  |  |  |  |  |  |  | 55,938 | 40,612 | 33,301
Loss from operations of discontinued businesses |  |  |  |  |  |  |  |  | 0 | 0 | 0
Benefit from income taxes |  |  |  |  |  |  |  |  | 0 | 0 | 0
Loss from discontinued operations |  |  |  |  |  |  |  |  | 0 | 0 | 0
Net income (loss) |  |  |  |  |  |  |  |  | 55,938 | 40,612 | 33,301
Comprehensive income (loss) |  |  |  |  |  |  |  |  | 34,318 | 28,355 | 10,903
Non-Guarantor Subsidiaries [Member] |  |  |  |  |  |  |  |  |  |  |
Condensed Income Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 475,380 | 519,349 | 463,767
Cost of goods and services |  |  |  |  |  |  |  |  | 377,348 | 424,568 | 392,588
Gross profit |  |  |  |  |  |  |  |  | 98,032 | 94,781 | 71,179
Selling, general and administrative expenses |  |  |  |  |  |  |  |  | 80,073 | 75,551 | 52,819
Restructuring and other related charges |  |  |  |  |  |  |  |  | 0 | 1,902 | 4,026
Total operating expenses |  |  |  |  |  |  |  |  | 80,073 | 77,453 | 56,845
Income from operations |  |  |  |  |  |  |  |  | 17,959 | 17,328 | 14,334
Other income (expense) |  |  |  |  |  |  |  |  |  |  |
Interest income (expense), net |  |  |  |  |  |  |  |  | (8,584) | (9,435) | (10,126)
Other, net |  |  |  |  |  |  |  |  | (8,775) | (4,228) | (7,233)
Total other income (expense) |  |  |  |  |  |  |  |  | (17,359) | (13,663) | (17,359)
Income (loss) before taxes |  |  |  |  |  |  |  |  | 600 | 3,665 | (3,025)
Provision (benefit) for income taxes |  |  |  |  |  |  |  |  | (712) | 25 | 1,781
Income (loss) before equity in net income of subsidiaries |  |  |  |  |  |  |  |  | 1,312 | 3,640 | (4,806)
Equity in net income (loss) of subsidiaries |  |  |  |  |  |  |  |  | 52,876 | 37,081 | 34,768
Income (loss) from continuing operations |  |  |  |  |  |  |  |  | 54,188 | 40,721 | 29,962
Loss from operations of discontinued businesses |  |  |  |  |  |  |  |  | 0 | 0 | (4,651)
Benefit from income taxes |  |  |  |  |  |  |  |  | 0 | 0 | 1,628
Loss from discontinued operations |  |  |  |  |  |  |  |  | 0 | 0 | (3,023)
Net income (loss) |  |  |  |  |  |  |  |  | 54,188 | 40,721 | 26,939
Comprehensive income (loss) |  |  |  |  |  |  |  |  | 15,080 | 25,704 | 64,671
Elimination [Member] |  |  |  |  |  |  |  |  |  |  |
Condensed Income Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | (40,643) | (54,216) | (52,145)
Cost of goods and services |  |  |  |  |  |  |  |  | (41,966) | (48,424) | (46,286)
Gross profit |  |  |  |  |  |  |  |  | 1,323 | (5,792) | (5,859)
Selling, general and administrative expenses |  |  |  |  |  |  |  |  | (370) | (6,466) | (6,252)
Restructuring and other related charges |  |  |  |  |  |  |  |  | 0 | 0 | 0
Total operating expenses |  |  |  |  |  |  |  |  | (370) | (6,466) | (6,252)
Income from operations |  |  |  |  |  |  |  |  | 1,693 | 674 | 393
Other income (expense) |  |  |  |  |  |  |  |  |  |  |
Interest income (expense), net |  |  |  |  |  |  |  |  | 0 | 0 | 0
Other, net |  |  |  |  |  |  |  |  | (1,693) | (674) | (346)
Total other income (expense) |  |  |  |  |  |  |  |  | (1,693) | (674) | (346)
Income (loss) before taxes |  |  |  |  |  |  |  |  | 0 | 0 | 47
Provision (benefit) for income taxes |  |  |  |  |  |  |  |  | 0 | 0 | 47
Income (loss) before equity in net income of subsidiaries |  |  |  |  |  |  |  |  | 0 | 0 | 0
Equity in net income (loss) of subsidiaries |  |  |  |  |  |  |  |  | (110,126) | (81,333) | (60,240)
Income (loss) from continuing operations |  |  |  |  |  |  |  |  | (110,126) | (81,333) | (60,240)
Loss from operations of discontinued businesses |  |  |  |  |  |  |  |  | 0 | 0 | 0
Benefit from income taxes |  |  |  |  |  |  |  |  | 0 | 0 | 0
Loss from discontinued operations |  |  |  |  |  |  |  |  | 0 | 0 | 0
Net income (loss) |  |  |  |  |  |  |  |  | (110,126) | (81,333) | (60,240)
Comprehensive income (loss) |  |  |  |  |  |  |  |  | $ (49,398) | $ (54,059) | $ (75,574)

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