SUPPLEMENTAL BALANCE SHEET INFORMATION (Tables)

12 Months Ended

Sep. 30, 2017

SUPPLEMENTAL BALANCE SHEET INFORMATION

Schedule of supplemental balance sheet information, reflecting activity in the entity's reserve for bad debt

	September 30,
	2017		2016		2015
	(in thousands)
Reserve for bad debt:
Balance at October 1,	$	2,696	$	6,181	$	4,597
Provision for (recovery of) bad debt		2,016		(2,013)		6,034
(Write-off) recovery of bad debt		1,009		(1,472)		(4,450)
Balance at September 30,	$	5,721	$	2,696	$	6,181

Schedule of supplemental balance sheet information, Accounts receivable, prepaid expenses and other current assets, accrued liabilities and long-term liabilities

	September 30,
	2017		2016
	(in thousands)
Accounts receivable, net of reserve:
Trade receivables	$	398,348	$	286,998
Income tax receivable		78,726		37,971
Insurance recovery receivable		—		50,200
Total accounts receivable, net of reserve	$	477,074	$	375,169
Prepaid expenses and other current assets:
Restricted cash	$	32,439	$	27,566
Deferred mobilization		6,458		9,913
Prepaid insurance		4,060		4,354
Prepaid value added tax		3,870		1,407
Prepaid income taxes		—		26,138
Other		8,293		8,689
Total prepaid expenses and other current assets	$	55,120	$	78,067
Accrued liabilities:
Accrued operating costs	$	36,949	$	17,009
Payroll and employee benefits		54,941		43,547
Taxes payable, other than income tax		35,638		31,443
Self-insurance liabilities		22,159		14,801
Deferred income		25,893		34,681
Deferred mobilization		9,828		17,923
Accrued income taxes		8,011		—
Litigation and claims		1,779		70,535
Other		13,485		4,700
Total accrued liabilities	$	208,683	$	234,639
Noncurrent liabilities — Other:
Pension and other non-qualified retirement plans	$	37,989	$	39,762
Self-insurance liabilities		29,037		21,651
Contingent earnout liability		14,879		—
Deferred mobilization		7,689		24,781
Uncertain tax positions including interest and penalties		3,562		12,502
Other		8,253		4,085
Total noncurrent liabilities — other	$	101,409	$	102,781