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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

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