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SUPPLEMENTAL BALANCE SHEET INFORMATION (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2014
Reserve for bad debt: |  |  |
Balance at the beginning of the period | $ 6,181 | $ 4,597 | $ 4,795
Provision for (recovery of) bad debt | (2,013) | 6,034 | (200)
Write off of bad debt | (1,472) | (4,450) | 2
Balance at the end of the period | 2,696 | 6,181 | $ 4,597
Accounts receivable, net of reserve: |  |  |
Trade receivables | 286,998 | 445,948 |
Insurance recovery receivable | 50,200 |  |
Income tax receivable | 37,971 |  |
Total accounts receivable, net of reserve | 375,169 | 445,948 |
Prepaid expenses and other current assets: |  |  |
Restricted cash | 27,566 | 28,484 |
Prepaid insurance | 4,354 | 6,386 |
Deferred mobilization | 9,913 | 11,697 |
Prepaid income taxes | 26,138 | 6,867 |
Prepaid value added tax | 1,407 | 1,055 |
Other | 8,689 | 9,986 |
Total prepaid expenses and other current assets | 78,067 | 64,475 |
Accrued liabilities: |  |  |
Accrued operating costs | 17,009 | 34,292 |
Payroll and employee benefits | 43,547 | 36,101 |
Taxes payable, other than income tax | 31,443 | 38,571 |
Deferred mobilization | 17,923 | 18,230 |
Self-insurance liabilities | 14,801 | 10,796 |
Deferred income | 34,681 | 42,769 |
Other | 4,700 | 16,798 |
Litigation and claims | 70,535 |  |
Total accrued liabilities | 234,639 | 197,557 |
Noncurrent liabilities - Other: |  |  |
Pension and other non-qualified retirement plans | 39,762 | 28,423 |
Self-insurance liabilities | 21,651 | 20,846 |
Deferred mobilization | 24,781 | 38,492 |
Uncertain tax positions including interest and penalties | 12,502 | 17,724 |
Other | 4,085 | 4,635 |
Total noncurrent liabilities - other | $ 102,781 | $ 110,120 |

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- Definition The total amount due to the entity within one year of the balance sheet date (or one operating cycle, if longer) from outside sources, including trade accounts receivable, notes and loans receivable, as well as any other types of receivables, net of allowances established for the purpose of reducing such receivables to an amount that approximates their net realizable value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(4)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 210 -Section S99 -Paragraph 3 -Subparagraph (SX 210.6-06(3)) -URI http://asc.fasb.org/extlink&oid=6488278&loc=d3e604059-122996 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(3)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(5)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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- Definition The carrying amounts of cash and cash equivalent items which are restricted as to withdrawal or usage. Restrictions may include legally restricted deposits held as compensating balances against short-term borrowing arrangements, contracts entered into with others, or entity statements of intention with regard to particular deposits; however, time deposits and short-term certificates of deposit are not generally included in legally restricted deposits. Excludes compensating balance arrangements that are not agreements which legally restrict the use of cash amounts shown on the balance sheet. For a classified balance sheet represents the current portion only (the noncurrent portion has a separate concept); there is a separate and distinct element for unclassified presentations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.1) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Carrying amount of accrued known and estimated losses incurred as of the balance sheet date for which no insurance coverage exists, and for which a claim has been made or is probable of being asserted, typically arising from workmen's compensation-type of incidents and personal injury to nonemployees from accidents on the entity's property that are expected to be paid within one year (or the normal operating cycle, if longer). + References No definition available. + Details
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- Definition Carrying amount of accrued known and estimated losses incurred as of the balance sheet date for which no insurance coverage exists, and for which a claim has been made or is probable of being asserted, typically arising from workmen's compensation-type of incidents and personal injury to nonemployees from accidents on the entity's property that are expected to be paid after one year (or the normal operating cycle, if longer). + References No definition available. + Details
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