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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

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Period Type: | instant

X
- Definition Carrying amount of accrued known and estimated losses incurred as of the balance sheet date for which no insurance coverage exists, and for which a claim has been made or is probable of being asserted, typically arising from workmen's compensation-type of incidents and personal injury to nonemployees from accidents on the entity's property that are expected to be paid after one year (or the normal operating cycle, if longer). + References No definition available. + Details
Name: | us-gaap_SelfInsuranceReserveNoncurrent
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant