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BUSINESS SEGMENTS AND GEOGRAPHIC INFORMATION - Schedule of Financial Information of Reportable Segments (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Jun. 30, 2026 | Jun. 30, 2025 | Jun. 30, 2026 | Jun. 30, 2025
Segment Reporting [Line Items] |  |  |  |
Total revenues | $ 1,034,856 | $ 1,040,924 | $ 2,984,244 | $ 2,734,265
Depreciation and amortization | 180,960 | 179,491 | 543,613 | 436,228
Selling, general and administrative | 65,849 | 65,506 | 207,373 | 209,407
Acquisition transaction and integration costs | 1,671 | 8,623 | 7,814 | 49,025
Asset impairment charges | 1,153 | 173,258 | 130,340 | 175,102
OPERATING INCOME (LOSS) | 188,211 | (128,269) | 91,380 | 4,780
Operating Segments |  |  |  |
Segment Reporting [Line Items] |  |  |  |
Total revenues | 986,881 | 1,018,852 | 2,874,441 | 2,689,736
Direct operating expenses | 685,941 | 696,741 | 2,027,286 | 1,784,137
Depreciation and amortization | 168,784 | 167,493 | 514,043 | 414,718
Research and development | 6,015 | 7,617 | 19,538 | 26,560
Selling, general and administrative | 21,716 | 17,280 | 61,231 | 57,856
Acquisition transaction and integration costs | 186 | 148 | 2,745 | 452
Asset impairment charges | 1,153 | 128,352 | 127,304 | 129,859
Restructuring charges | 949 | 2,258 | 2,971 | 2,258
OPERATING INCOME (LOSS) | 102,684 | (95) | 125,762 | 275,472
Intersegment revenues |  |  |  |
Segment Reporting [Line Items] |  |  |  |
Total revenues | 547 | 942 | 6,439 | 1,576
OPERATING INCOME (LOSS) |  | 6,114 | (1,774) | (2,247)
Operating Segments Excluding Intersegment Elimination |  |  |  |
Segment Reporting [Line Items] |  |  |  |
Total revenues | 987,428 | 1,019,794 | 2,880,880 | 2,691,312
OPERATING INCOME (LOSS) | 105,556 | (63,985) | 116,712 | 202,620
All other revenues |  |  |  |
Segment Reporting [Line Items] |  |  |  |
Total revenues | 69,765 | 42,898 | 176,278 | 107,704
OPERATING INCOME (LOSS) | 1,344 | (70,004) | (7,276) | (70,605)
Elimination of intersegment revenues |  |  |  |
Segment Reporting [Line Items] |  |  |  |
Total revenues | (22,337) | (21,768) | (72,914) | (64,751)
OPERATING INCOME (LOSS) | 1,528 |  |  |
North America Solutions |  |  |  |
Segment Reporting [Line Items] |  |  |  |
Direct operating expenses | 321,686 | 326,042 | 948,857 | 992,462
Depreciation and amortization | 83,214 | 88,078 | 250,413 | 263,565
Research and development | 6,015 | 7,617 | 19,538 | 26,560
Selling, general and administrative | 11,282 | 10,972 | 38,705 | 42,266
Acquisition transaction and integration costs | 0 | 7 | 0 | 41
Asset impairment charges | 0 | 0 | 97,922 | 1,507
Restructuring charges | 393 | 1,849 | 795 | 1,849
North America Solutions | Operating Segments |  |  |  |
Segment Reporting [Line Items] |  |  |  |
Total revenues | 562,565 | 591,976 | 1,643,150 | 1,789,350
OPERATING INCOME (LOSS) | 140,312 | 157,649 | 287,855 | 461,803
North America Solutions | Intersegment revenues |  |  |  |
Segment Reporting [Line Items] |  |  |  |
Total revenues | 337 | 238 | 935 | 703
North America Solutions | Operating Segments Excluding Intersegment Elimination |  |  |  |
Segment Reporting [Line Items] |  |  |  |
Total revenues | 562,902 | 592,214 | 1,644,085 | 1,790,053
International Solutions |  |  |  |
Segment Reporting [Line Items] |  |  |  |
Direct operating expenses | 219,064 | 231,695 | 631,463 | 507,106
Depreciation and amortization | 74,547 | 66,734 | 231,925 | 128,715
Research and development | 0 | 0 | 0 | 0
Selling, general and administrative | 9,097 | 5,014 | 17,491 | 12,268
Acquisition transaction and integration costs | 186 | 141 | 1,820 | 351
Asset impairment charges | 1,153 | 128,352 | 27,254 | 128,352
Restructuring charges | 498 | 380 | 2,118 | 380
International Solutions | Operating Segments |  |  |  |
Segment Reporting [Line Items] |  |  |  |
Total revenues | 249,907 | 265,099 | 697,222 | 560,319
OPERATING INCOME (LOSS) | (54,428) | (166,513) | (209,345) | (215,980)
International Solutions | Intersegment revenues |  |  |  |
Segment Reporting [Line Items] |  |  |  |
Total revenues | 210 | 704 | 5,504 | 873
International Solutions | Operating Segments Excluding Intersegment Elimination |  |  |  |
Segment Reporting [Line Items] |  |  |  |
Total revenues | 250,117 | 265,803 | 702,726 | 561,192
Offshore Solutions |  |  |  |
Segment Reporting [Line Items] |  |  |  |
Direct operating expenses | 145,191 | 139,004 | 446,966 | 284,569
Depreciation and amortization | 11,023 | 12,681 | 31,705 | 22,438
Research and development | 0 | 0 | 0 | 0
Selling, general and administrative | 1,337 | 1,294 | 5,035 | 3,322
Acquisition transaction and integration costs | 0 | 0 | 925 | 60
Asset impairment charges | 0 | 0 | 2,128 | 0
Restructuring charges | 58 | 29 | 58 | 29
Offshore Solutions | Operating Segments |  |  |  |
Segment Reporting [Line Items] |  |  |  |
Total revenues | 174,409 | 161,777 | 534,069 | 340,067
OPERATING INCOME (LOSS) | 16,800 | 8,769 | 47,252 | 29,649
Offshore Solutions | Intersegment revenues |  |  |  |
Segment Reporting [Line Items] |  |  |  |
Total revenues | 0 | 0 | 0 | 0
Offshore Solutions | Operating Segments Excluding Intersegment Elimination |  |  |  |
Segment Reporting [Line Items] |  |  |  |
Total revenues | $ 174,409 | $ 161,777 | $ 534,069 | $ 340,067

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