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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