v3.26.1
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