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SUPPLEMENTAL BALANCE SHEET INFORMATION
12 Months Ended
Sep. 30, 2019
Balance Sheet Related Disclosures [Abstract]  
SUPPLEMENTAL BALANCE SHEET INFORMATION
NOTE 15 SUPPLEMENTAL BALANCE SHEET INFORMATION

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 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