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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, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2016
Condensed Income Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue | $ 545,505 | $ 516,550 | $ 478,560 | $ 437,303 | $ 430,799 | $ 358,114 | $ 383,807 | $ 352,277 | $ 1,977,918 | $ 1,524,997 | $ 1,477,035
Cost of goods and services |  |  |  |  |  |  |  |  | 1,448,358 | 1,116,881 | 1,076,342
Gross profit | 148,451 | 138,792 | 121,473 | 120,844 | 114,519 | 97,984 | 98,869 | 96,744 | 529,560 | 408,116 | 400,693
Selling, general and administrative expenses |  |  |  |  |  |  |  |  | 433,110 | 339,089 | 318,353
Restructuring and other related charges |  |  |  |  |  |  |  |  |  | 0 | 0
Total operating expenses |  |  |  |  |  |  |  |  |  | 339,089 | 318,353
Income from continuing operations |  |  |  |  |  |  |  |  | 96,450 | 69,027 | 82,340
Other income (expense) |  |  |  |  |  |  |  |  |  |  |
Interest income (expense), net |  |  |  |  |  |  |  |  | (63,871) | (51,449) | (49,877)
Other, net |  |  |  |  |  |  |  |  | 1,231 | (880) | (250)
Total other income (expense) |  |  |  |  |  |  |  |  | (62,640) | (52,329) | (50,127)
Income before taxes from continuing operations |  |  |  |  |  |  |  |  | 33,810 | 16,698 | 32,213
Provision (benefit) for income taxes |  |  |  |  |  |  |  |  | 555 | (1,085) | 12,432
Income (loss) before equity in net income of subsidiaries |  |  |  |  |  |  |  |  | 33,255 | 17,783 | 19,781
Equity in net income (loss) of subsidiaries |  |  |  |  |  |  |  |  | 0 | 0 | 0
Income (loss) from continuing operations | $ 1,031 | $ 7,442 | $ 1,951 | $ 22,831 | $ 4,337 | $ 4,452 | $ 1,950 | $ 7,044 | 33,255 | 17,783 | 19,781
Income from operations of discontinued businesses |  |  |  |  |  |  |  |  | 119,981 | 22,276 | 20,952
Provision for income taxes |  |  |  |  |  |  |  |  | 27,558 | 25,147 | 10,723
Income (loss) from discontinued operations |  |  |  |  |  |  |  |  | 92,423 | (2,871) | 10,229
Net income |  |  |  |  |  |  |  |  | 125,678 | 14,912 | 30,010
Other comprehensive income, net of tax |  |  |  |  |  |  |  |  | 26,369 | 20,760 | 9,947
Comprehensive income (loss) |  |  |  |  |  |  |  |  | 152,047 | 35,672 | 39,957
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 |  |  |  |  |  |  |  |  | 38,691 | 42,273 | 26,427
Restructuring and other related charges |  |  |  |  |  |  |  |  |  | 0 | 0
Total operating expenses |  |  |  |  |  |  |  |  |  | 42,273 | 26,427
Income from continuing operations |  |  |  |  |  |  |  |  | (38,691) | (42,273) | (26,427)
Other income (expense) |  |  |  |  |  |  |  |  |  |  |
Interest income (expense), net |  |  |  |  |  |  |  |  | (23,911) | (13,804) | (12,549)
Other, net |  |  |  |  |  |  |  |  | (6,515) | 59 | 337
Total other income (expense) |  |  |  |  |  |  |  |  | (30,426) | (13,745) | (12,212)
Income before taxes from continuing operations |  |  |  |  |  |  |  |  | (69,117) | (56,018) | (38,639)
Provision (benefit) for income taxes |  |  |  |  |  |  |  |  | (17,692) | (11,338) | 4,964
Income (loss) before equity in net income of subsidiaries |  |  |  |  |  |  |  |  | (51,425) | (44,680) | (43,603)
Equity in net income (loss) of subsidiaries |  |  |  |  |  |  |  |  | 177,103 | 59,592 | 73,613
Income (loss) from continuing operations |  |  |  |  |  |  |  |  | 125,678 | 14,912 | 30,010
Income from operations of discontinued businesses |  |  |  |  |  |  |  |  | 0 | 0 | 0
Provision for income taxes |  |  |  |  |  |  |  |  | 0 | 0 | 0
Income (loss) from discontinued operations |  |  |  |  |  |  |  |  | 0 | 0 | 0
Net income |  |  |  |  |  |  |  |  | 125,678 | 14,912 | 30,010
Comprehensive income (loss) |  |  |  |  |  |  |  |  | 152,047 | 35,672 | 39,957
Guarantor Subsidiaries [Member] |  |  |  |  |  |  |  |  |  |  |
Condensed Income Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 1,638,792 | 1,284,189 | 1,277,241
Cost of goods and services |  |  |  |  |  |  |  |  | 1,232,019 | 966,293 | 952,296
Gross profit |  |  |  |  |  |  |  |  | 406,773 | 317,896 | 324,945
Selling, general and administrative expenses |  |  |  |  |  |  |  |  | 303,856 | 232,720 | 228,961
Restructuring and other related charges |  |  |  |  |  |  |  |  |  | 0 | 1,299
Total operating expenses |  |  |  |  |  |  |  |  |  | 232,720 | 230,260
Income from continuing operations |  |  |  |  |  |  |  |  | 102,917 | 85,176 | 94,685
Other income (expense) |  |  |  |  |  |  |  |  |  |  |
Interest income (expense), net |  |  |  |  |  |  |  |  | (31,913) | (24,242) | (24,050)
Other, net |  |  |  |  |  |  |  |  | 120,670 | 1,395 | 1,862
Total other income (expense) |  |  |  |  |  |  |  |  | 88,757 | (22,847) | (22,188)
Income before taxes from continuing operations |  |  |  |  |  |  |  |  | 191,674 | 62,329 | 72,497
Provision (benefit) for income taxes |  |  |  |  |  |  |  |  | 9,546 | 24,560 | 29,445
Income (loss) before equity in net income of subsidiaries |  |  |  |  |  |  |  |  | 182,128 | 37,769 | 43,052
Equity in net income (loss) of subsidiaries |  |  |  |  |  |  |  |  | (151,864) | (25,231) | (2,858)
Income (loss) from continuing operations |  |  |  |  |  |  |  |  | 30,264 | 12,538 | 40,194
Income from operations of discontinued businesses |  |  |  |  |  |  |  |  | 119,981 | 16,827 | 15,625
Provision for income taxes |  |  |  |  |  |  |  |  | 27,558 | 4,476 | 4,720
Income (loss) from discontinued operations |  |  |  |  |  |  |  |  | 92,423 | 12,351 | 10,905
Net income |  |  |  |  |  |  |  |  | 122,687 | 24,889 | 51,099
Comprehensive income (loss) |  |  |  |  |  |  |  |  | 143,936 | 35,575 | 44,391
Non-Guarantor Subsidiaries [Member] |  |  |  |  |  |  |  |  |  |  |
Condensed Income Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 367,149 | 270,520 | 228,350
Cost of goods and services |  |  |  |  |  |  |  |  | 245,687 | 181,634 | 154,181
Gross profit |  |  |  |  |  |  |  |  | 121,462 | 88,886 | 74,169
Selling, general and administrative expenses |  |  |  |  |  |  |  |  | 90,933 | 64,466 | 63,335
Restructuring and other related charges |  |  |  |  |  |  |  |  |  | 0 | (1,299)
Total operating expenses |  |  |  |  |  |  |  |  |  | 64,466 | 62,036
Income from continuing operations |  |  |  |  |  |  |  |  | 30,529 | 24,420 | 12,133
Other income (expense) |  |  |  |  |  |  |  |  |  |  |
Interest income (expense), net |  |  |  |  |  |  |  |  | (8,047) | (13,403) | (13,278)
Other, net |  |  |  |  |  |  |  |  | (111,187) | (630) | (500)
Total other income (expense) |  |  |  |  |  |  |  |  | (119,234) | (14,033) | (13,778)
Income before taxes from continuing operations |  |  |  |  |  |  |  |  | (88,705) | 10,387 | (1,645)
Provision (benefit) for income taxes |  |  |  |  |  |  |  |  | 8,743 | (14,307) | (21,977)
Income (loss) before equity in net income of subsidiaries |  |  |  |  |  |  |  |  | (97,448) | 24,694 | 20,332
Equity in net income (loss) of subsidiaries |  |  |  |  |  |  |  |  | 182,128 | 37,770 | 43,052
Income (loss) from continuing operations |  |  |  |  |  |  |  |  | 84,680 | 62,464 | 63,384
Income from operations of discontinued businesses |  |  |  |  |  |  |  |  | 0 | 5,449 | 5,327
Provision for income taxes |  |  |  |  |  |  |  |  | 0 | 20,671 | 6,003
Income (loss) from discontinued operations |  |  |  |  |  |  |  |  | 0 | (15,222) | (676)
Net income |  |  |  |  |  |  |  |  | 84,680 | 47,242 | 62,708
Comprehensive income (loss) |  |  |  |  |  |  |  |  | 81,389 | 38,337 | 90,560
Consolidation, Eliminations [Member] |  |  |  |  |  |  |  |  |  |  |
Condensed Income Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | (28,023) | (29,712) | (28,556)
Cost of goods and services |  |  |  |  |  |  |  |  | (29,348) | (31,046) | (30,135)
Gross profit |  |  |  |  |  |  |  |  | 1,325 | 1,334 | 1,579
Selling, general and administrative expenses |  |  |  |  |  |  |  |  | (370) | (370) | (370)
Restructuring and other related charges |  |  |  |  |  |  |  |  |  | 0 | 0
Total operating expenses |  |  |  |  |  |  |  |  |  | (370) | (370)
Income from continuing operations |  |  |  |  |  |  |  |  | 1,695 | 1,704 | 1,949
Other income (expense) |  |  |  |  |  |  |  |  |  |  |
Interest income (expense), net |  |  |  |  |  |  |  |  | 0 | 0 | 0
Other, net |  |  |  |  |  |  |  |  | (1,737) | (1,704) | (1,949)
Total other income (expense) |  |  |  |  |  |  |  |  | (1,737) | (1,704) | (1,949)
Income before taxes from continuing operations |  |  |  |  |  |  |  |  | (42) | 0 | 0
Provision (benefit) for income taxes |  |  |  |  |  |  |  |  | (42) | 0 | 0
Income (loss) before equity in net income of subsidiaries |  |  |  |  |  |  |  |  | 0 | 0 | 0
Equity in net income (loss) of subsidiaries |  |  |  |  |  |  |  |  | (207,367) | (72,131) | (113,807)
Income (loss) from continuing operations |  |  |  |  |  |  |  |  | (207,367) | (72,131) | (113,807)
Income from operations of discontinued businesses |  |  |  |  |  |  |  |  | 0 | 0 | 0
Provision for income taxes |  |  |  |  |  |  |  |  | 0 | 0 | 0
Income (loss) from discontinued operations |  |  |  |  |  |  |  |  | 0 | 0 | 0
Net income |  |  |  |  |  |  |  |  | (207,367) | (72,131) | (113,807)
Comprehensive income (loss) |  |  |  |  |  |  |  |  | $ (225,325) | $ (73,912) | $ (134,951)

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