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BUSINESS SEGMENTS AND GEOGRAPHIC INFORMATION - Schedule of Financial Information of Reportable Segments (Details) - USD ($)
$ in Thousands
 12 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2023
Segment Reporting Information [Line Items]      
Total revenues $ 3,746,013 $ 2,756,607 $ 2,872,421
Depreciation and amortization 625,085 397,344 382,314
Selling, general and administrative 287,052 244,883 206,687
Acquisition transaction costs 54,702 14,982 0
Asset impairment charges 194,030 0 12,097
OPERATING INCOME 3,318 457,449 568,308
Intersegment revenues      
Segment Reporting Information [Line Items]      
Total revenues (5,614) 0 0
OPERATING INCOME (3,999) 1,261 4,671
Operating Segments      
Segment Reporting Information [Line Items]      
Total revenues 3,679,533 2,746,128 2,862,553
Direct operating expenses 2,471,654 1,618,172 1,725,102
Depreciation and amortization 603,091 384,839 369,213
Research and development 34,140 41,293 30,507
Selling, general and administrative 89,898 74,134 71,833
Acquisition transaction costs 4,597    
Asset impairment charges 134,227   12,097
Restructuring charges 9,332    
OPERATING INCOME 338,208 627,690 653,801
All other revenues      
Segment Reporting Information [Line Items]      
Total revenues 163,687 71,630 77,296
OPERATING INCOME (103,397) (1,359) 15,876
Operating Segments Excluding Intersegment Elimination      
Segment Reporting Information [Line Items]      
Total revenues 3,685,147 2,746,128 2,862,553
OPERATING INCOME 230,812 627,592 674,348
Eliminations and Reconciling Items      
Segment Reporting Information [Line Items]      
Total revenues (102,821) (61,151) (67,428)
North America Solutions      
Segment Reporting Information [Line Items]      
Direct operating expenses 1,322,697 1,366,471 1,447,522
Depreciation and amortization 351,813 366,446 353,976
Research and development 34,140 41,293 30,507
Selling, general and administrative 68,047 61,113 58,397
Acquisition transaction costs 41    
Asset impairment charges 1,507   3,948
Restructuring charges 4,121    
North America Solutions | Intersegment revenues      
Segment Reporting Information [Line Items]      
Total revenues (1,039) 0 0
North America Solutions | Operating Segments      
Segment Reporting Information [Line Items]      
Total revenues 2,361,288 2,445,946 2,519,743
OPERATING INCOME 579,961 610,623 625,393
North America Solutions | Operating Segments Excluding Intersegment Elimination      
Segment Reporting Information [Line Items]      
Total revenues 2,362,327 2,445,946 2,519,743
International Solutions      
Segment Reporting Information [Line Items]      
Direct operating expenses 718,822 169,033 180,797
Depreciation and amortization 218,817 10,863 7,615
Research and development 0 0 0
Selling, general and administrative 17,232 9,427 10,401
Acquisition transaction costs 1,585    
Asset impairment charges 132,720   8,149
Restructuring charges 4,945    
International Solutions | Intersegment revenues      
Segment Reporting Information [Line Items]      
Total revenues (4,575) 0 0
International Solutions | Operating Segments      
Segment Reporting Information [Line Items]      
Total revenues 797,851 193,975 212,566
OPERATING INCOME (291,695) 4,652 5,604
International Solutions | Operating Segments Excluding Intersegment Elimination      
Segment Reporting Information [Line Items]      
Total revenues 802,426 193,975 212,566
Offshore Solutions      
Segment Reporting Information [Line Items]      
Direct operating expenses 430,135 82,668 96,783
Depreciation and amortization 32,461 7,530 7,622
Research and development 0 0 0
Selling, general and administrative 4,619 3,594 3,035
Acquisition transaction costs 2,971    
Asset impairment charges 0   0
Restructuring charges 266    
Offshore Solutions | Intersegment revenues      
Segment Reporting Information [Line Items]      
Total revenues 0 0 0
Offshore Solutions | Operating Segments      
Segment Reporting Information [Line Items]      
Total revenues 520,394 106,207 130,244
OPERATING INCOME 49,942 12,415 22,804
Offshore Solutions | Operating Segments Excluding Intersegment Elimination      
Segment Reporting Information [Line Items]      
Total revenues $ 520,394 $ 106,207 $ 130,244