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Detail of Selected Balance Sheet Accounts (Tables)
 12 Months Ended
Sep. 30, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract]  
Activity in Allowance for Doubtful Accounts
Activity in our allowance for doubtful accounts consisted of the following (in thousands): 
 
September 30,
 
2018
 
2017
Balance at beginning of period
$
179

 
$
811

Bad debt expense (recovery)
111

 
(160
)
Uncollectible accounts written off, net of recoveries
(125
)
 
(472
)
Change due to foreign currency translation
(8
)
 
—

Balance at end of period
$
157

 
$
179
Components of Inventories
The components of inventories are summarized below (in thousands): 
 
September 30,
 
2018
 
2017
Raw materials, parts and subassemblies
$
24,563

 
$
22,100

Work-in-progress
1,080

 
600

Provision for excess and obsolete inventory
(4,291
)
 
(4,252
)
Total inventories
$
21,352

 
$
18,448
Components of Cost and Estimated Earnings and Related Amounts Billed on Uncompleted Contracts
The components of costs and estimated earnings and related amounts billed on uncompleted contracts are summarized below (in thousands):
 
September 30,
  
2018
 
2017
Costs incurred on uncompleted contracts
$
872,882

 
$
987,164

Estimated earnings
269,268

 
316,970

 
1,142,150


1,304,134

Less: Billings to date
(1,102,779
)
 
(1,278,746
)
Net underbilled position
$
39,371

 
$
25,388

Included in the accompanying balance sheets under the following captions:
 
 
 
Costs and estimated earnings in excess of billings on uncompleted contracts – underbilled
$
82,545

 
$
51,554

Billings in excess of costs and estimated earnings on uncompleted contracts – overbilled
(43,174
)
 
(26,166
)
Net underbilled position
$
39,371

 
$
25,388
Schedule of Property, Plant and Equipment
Property, plant and equipment are summarized below (in thousands): 
 
September 30,
 
Range of
 
2018
 
2017
 
Asset Lives
Land
$
22,207

 
$
22,441

 
—
Buildings and improvements
123,320

 
121,960

 
3 - 39 Years
Machinery and equipment
104,542

 
106,113

 
3 - 15 Years
Furniture and fixtures
3,799

 
3,806

 
3 - 10 Years
Construction in process
357

 
1,749

 
—
 
$
254,225

 
$
256,069

 
 
Less: Accumulated depreciation
(125,461
)
 
(116,649
)
 
 
Total property, plant and equipment, net
$
128,764

 
$
139,420

 
 
Activity in Warranty Accrual
Activity in our warranty accrual consisted of the following (in thousands): 
 
September 30,
 
2018
 
2017
Balance at beginning of period
$
3,174

 
$
4,639

Increase to warranty expense
2,031

 
1,806

Deduction for warranty charges
(2,574
)
 
(3,314
)
Change due to foreign currency translation
(27
)
 
43

Balance at end of period
$
2,604

 
$
3,174