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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, 2022
Sep. 30, 2021
Accounts receivable, net of reserve:    
Trade receivables $ 430,944 $ 204,424
Income tax receivable 27,769 24,470
Total accounts receivable, net of reserve 458,713 228,894
Prepaid expenses and other current assets, net:    
Deferred mobilization 5,048 3,734
Prepaid insurance 7,498 7,313
Prepaid value added tax 6,628 7,682
Prepaid maintenance and rent 13,092 5,540
Accrued demobilization, net 6,319 4,513
Prepaid operating expenses 0 17,959
Prepaid equipment 10,091 0
Other 17,787 20,837
Total prepaid expenses and other current assets, net 66,463 67,578
Accrued liabilities:    
Accrued operating costs 26,539 20,872
Payroll and employee benefits 58,604 69,311
Taxes payable, other than income tax 26,786 25,329
Self-insurance liabilities 38,422 40,060
Deferred income 19,821 8,546
Advance payment for sale of property, plant and equipment 0 86,524
Deferred mobilization revenue 8,959 4,662
Accrued income taxes 40,833 881
Contingent liability 2,750 5,985
Operating lease liability 12,382 12,624
Other 6,055 8,698
Total accrued liabilities 241,151 283,492
Noncurrent liabilities — Other:    
Pension and other non-qualified retirement plans 40,423 47,263
Self-insurance liabilities 38,422 40,910
Contingent liability 1,272 1,759
Deferred revenue 3,162 1,003
Uncertain tax positions including interest and penalties 2,381 2,578
Operating lease liability 27,350 37,864
Payroll tax deferral 0 15,424
Other 377 956
Total noncurrent liabilities — other $ 113,387 $ 147,757