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SUPPLEMENTAL BALANCE SHEET INFORMATION - Accounts Receivable, Prepaid Expenses and Other Current Assets, Accrued Liabilities and Long-Term Liabilities (Details) - USD ($)
$ in Thousands
Sep. 30, 2025
Sep. 30, 2024
Accounts receivable, net of allowance:    
Trade receivables $ 752,808 $ 418,586
Income tax receivable 29,836 18
Total accounts receivable, net of allowance 782,644 418,604
Prepaid expenses and other current assets, net:    
Deferred mobilization 20,291 8,329
Prepaid insurance 14,855 10,277
Prepaid value added tax 19,263 5,644
Prepaid maintenance and rent 16,888 12,802
Accrued demobilization, net 4,969 4,563
Prepaid equipment 1,516 23,249
Insurance recoverable 4,486 6,706
Other 15,250 4,849
Total prepaid expenses and other current assets, net 97,518 76,419
Accrued liabilities:    
Accrued operating costs 116,743 60,179
Payroll, benefits, and restructuring costs 174,974 86,855
Taxes payable, other than income tax 74,007 36,339
Self-insurance liabilities 39,067 41,040
Deferred income 38,083 10,432
Deferred mobilization revenue 21,740 8,626
Accrued income taxes 11,871 7,020
Interest payable 21,898 2,690
Operating lease liability 35,960 16,997
Litigation and claims 6,417 5,881
Other 24,095 10,782
Total accrued liabilities 564,855 286,841
Noncurrent liabilities — Other:    
Other non-qualified retirement plans 22,747 21,753
Self-insurance liabilities 81,726 41,040
Deferred revenue 30,121 10,123
Uncertain tax positions including interest and penalties 23,948 790
Operating lease liability 110,120 59,733
Other 1,954 171
Total noncurrent liabilities — other $ 270,616 $ 133,610