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SUPPLEMENTAL BALANCE SHEET INFORMATION (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Sep. 30, 2015 | Sep. 30, 2014 | Sep. 30, 2013
Reserve for bad debt: |  |  |
Balance at the beginning of the period | $ 4,597 | $ 4,795 | $ 942
Provision for (recovery of) bad debt | 6,034 | (200) | 3,875
Write-off of bad debt | (4,450) |  | (22)
Write-off of bad debt |  | 2 |
Balance at the end of the period | 6,181 | 4,597 | $ 4,795
Prepaid expenses and other current assets: |  |  |
Restricted cash | 29,998 | 28,244 |
Prepaid insurance | 6,572 | 13,316 |
Deferred mobilization | 11,899 | 20,133 |
Prepaid income taxes | 7,320 |  |
Prepaid value added tax | 1,063 | 434 |
Other | 15,265 | 18,785 |
Total prepaid expenses and other current assets | 72,117 | 80,912 |
Accrued liabilities: |  |  |
Accrued operating costs | 28,022 | 91,408 |
Payroll and employee benefits | 35,938 | 88,128 |
Taxes payable, other than income tax | 38,992 | 42,538 |
Accrued income taxes |  | 10,611 |
Deferred mobilization | 18,230 | 18,103 |
Self-insurance liabilities | 10,796 | 8,118 |
Deferred income | 42,627 | 3,144 |
Other | 23,448 | 20,228 |
Total accrued liabilities | 198,053 | 282,278 |
Noncurrent liabilities - Other: |  |  |
Pension and other non-qualified retirement plans | 28,430 | 25,305 |
Self-insurance liabilities | 20,846 | 13,476 |
Deferred mobilization | 39,469 | 3,818 |
Uncertain tax positions including interest and penalties | 17,724 | 13,239 |
Other | 4,635 | 8,272 |
Total noncurrent liabilities - other | $ 111,104 | $ 64,110 |

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