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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, 2019
Sep. 30, 2018
Accounts receivable, net of reserve:    
Trade receivables $ 461,774 $ 530,859
Income tax receivable 33,828 34,343
Total accounts receivable, net of reserve 495,602 565,202
Prepaid expenses and other current assets:    
Restricted cash 31,291 39,830
Deferred mobilization   6,484
Prepaid insurance 5,556 6,149
Prepaid value added tax 5,209 1,931
Prepaid maintenance and rent 9,113 8,526
Prepaid multi-flex rig fabrication 0 1,327
Accrued demobilization 2,151 0
Other 5,037 2,151
Total prepaid expenses and other current assets 68,928 66,398
Accrued liabilities:    
Accrued operating costs 34,992 37,528
Payroll and employee benefits 79,465 80,915
Taxes payable, other than income tax 50,566 50,683
Self-insurance liabilities 37,117 15,887
Deferred income 25,426 20,527
Deferred mobilization 14,737 9,662
Accrued income taxes 19,277 7,375
Escrow 1,388 11,258
Litigation and claims 9,990 1,749
Contingent earnout liability 5,535 0
Other 8,599 8,920
Total accrued liabilities 287,092 244,504
Noncurrent liabilities — Other:    
Pension and other non-qualified retirement plans 51,768 35,051
Self-insurance liabilities 37,118 39,380
Contingent earnout liability 12,838 11,160
Deferred mobilization 9,471 2,738
Uncertain tax positions including interest and penalties 2,544 2,870
Other 2,007 2,407
Total noncurrent liabilities — other $ 115,746 $ 93,606