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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, 2023
Sep. 30, 2022
Accounts receivable, net of reserve:    
Trade receivables $ 403,091 $ 430,944
Income tax receivable 1,097 27,769
Total accounts receivable, net of reserve 404,188 458,713
Prepaid expenses and other current assets, net:    
Deferred mobilization 7,873 5,048
Prepaid insurance 11,160 7,498
Prepaid value added tax 7,867 6,628
Prepaid maintenance and rent 12,278 13,092
Accrued demobilization, net 6,560 6,319
Prepaid equipment 21,821 10,091
Insurance Recoverable 28,129 9,684
Other 2,039 8,103
Total prepaid expenses and other current assets, net 97,727 66,463
Accrued liabilities:    
Accrued operating costs 20,618 26,539
Payroll and employee benefits 55,596 58,604
Taxes payable, other than income tax 32,537 26,786
Self-insurance liabilities 60,921 38,422
Deferred income 23,441 19,821
Deferred mobilization revenue 10,247 8,959
Accrued income taxes 24,495 40,833
Contingent consideration 9,455 2,750
Operating lease liability 13,772 12,382
Other 11,803 6,055
Total accrued liabilities 262,885 241,151
Noncurrent liabilities — Other:    
Pension and other non-qualified retirement plans 33,048 40,423
Self-insurance liabilities 42,285 38,422
Contingent liability 0 1,272
Deferred revenue 8,135 3,162
Uncertain tax positions including interest and penalties 3,136 2,381
Operating lease liability 41,038 27,350
Other 487 1,917
Total noncurrent liabilities — other $ 128,129 $ 114,927