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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, 2020
Oct. 01, 2019
Sep. 30, 2019
Accounts receivable, net of reserve:      
Trade receivables $ 150,249   $ 461,774
Income tax receivable 42,374   33,828
Total accounts receivable, net of reserve 192,623   495,602
Prepaid expenses and other current assets:      
Restricted cash 45,577   31,291
Deferred mobilization 4,528   10,571
Prepaid insurance 8,655   5,556
Prepaid value added tax 7,484   5,209
Prepaid maintenance and rent 7,273   9,113
Accrued demobilization 2,367   2,151
Other 13,421   5,037
Total prepaid expenses and other current assets 89,305   68,928
Accrued liabilities:      
Accrued operating costs 10,942   34,992
Payroll and employee benefits 27,068   79,465
Taxes payable, other than income tax 39,762   50,566
Self-insurance liabilities 36,518   37,117
Deferred income 9,266   25,426
Deferred mobilization revenue 5,705   14,737
Accrued income taxes 0   19,277
Escrow 138   1,388
Litigation and claims 393   9,990
Contingent earnout liability 4,926   5,535
Operating lease liability 11,364 $ 16,277  
Other 9,360   8,599
Total accrued liabilities 155,442   287,092
Noncurrent liabilities — Other:      
Pension and other non-qualified retirement plans 54,043   51,768
Self-insurance liabilities 37,369   37,118
Contingent earnout liability 4,197   12,838
Deferred revenue 2,955   9,471
Uncertain tax positions including interest and penalties 2,895   2,544
Operating lease liability 33,886 $ 39,794  
Payroll tax deferral 10,205   0
Other 1,630   2,007
Total noncurrent liabilities — other $ 147,180   $ 115,746