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SUPPLEMENTAL BALANCE SHEET INFORMATION (Tables) | 12 Months Ended
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Sep. 30, 2019
Balance Sheet Related Disclosures [Abstract] |
Activity in the Reserve for Bad Debts | The following reflects the activity in our reserve for bad debt for fiscal years 2019, 2018 and 2017:
(in thousands) | 2019 |  | 2018 |  | 2017
Reserve for bad debt: |  |  |  |  |
Balance at October 1, | $ | 6,217 |  |  | $ | 5,721 |  |  | $ | 2,696 |
Provision for bad debt | 2,321 |  |  | 2,193 |  |  | 2,016 |
(Write-off) recovery of bad debt | 1,389 |  |  | (1,697 | ) |  | 1,009 |
Balance at September 30, | $ | 9,927 |  |  | $ | 6,217 |  |  | $ | 5,721 |
Accounts Receivable, Prepaid Expenses and Other Current Assets, Accrued Liabilities and Long-Term Liabilities | Accounts receivable, prepaid expenses and other current assets, accrued liabilities and long-term liabilities at September 30, 2019 and 2018 consist of the following:
| September 30,
(in thousands) | 2019 |  | 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 | 10,571 |  |  | 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 | — |  |  | 1,327 |
Accrued demobilization | 2,151 |  |  | — |
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 revenue | 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 |  |  | — |
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 revenue | 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 |

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