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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, 2021
Sep. 30, 2020
Accounts receivable, net of reserve:    
Trade receivables $ 204,424 $ 150,249
Income tax receivable 24,470 42,374
Total accounts receivable, net of reserve 228,894 192,623
Prepaid expenses and other current assets:    
Restricted cash 18,350 45,577
Deferred mobilization 3,734 4,528
Prepaid insurance 7,313 8,655
Prepaid value added tax 7,682 7,484
Prepaid maintenance and rent 5,540 7,273
Accrued demobilization, net 4,513 2,367
Prepaid operating expenses 17,959 0
Other 20,837 13,421
Total prepaid expenses and other current assets 85,928 89,305
Accrued liabilities:    
Accrued operating costs 20,872 10,942
Payroll and employee benefits 69,311 27,068
Taxes payable, other than income tax 25,329 39,762
Self-insurance liabilities 40,060 36,518
Deferred income 8,546 9,266
Advance payment for sale of property, plant and equipment 86,524 0
Deferred mobilization revenue 4,662 5,705
Accrued income taxes 881 0
Escrow 138 138
Litigation and claims 1,463 393
Contingent liability 5,985 4,926
Operating lease liability 12,624 11,364
Accrued interest 930 937
Other 6,167 8,423
Total accrued liabilities 283,492 155,442
Noncurrent liabilities — Other:    
Pension and other non-qualified retirement plans 47,263 54,043
Self-insurance liabilities 40,910 37,369
Contingent liability 1,759 4,197
Deferred revenue 1,003 2,955
Uncertain tax positions including interest and penalties 2,578 2,895
Operating lease liability 37,864 33,886
Payroll tax deferral 15,424 10,205
Other 956 1,630
Total noncurrent liabilities — other $ 147,757 $ 147,180