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Detail of Selected Balance Sheet Accounts (Tables)
 12 Months Ended
Sep. 30, 2017
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,
 
2017
 
2016
Balance at beginning of period
$
811

 
$
746

Bad debt expense (recovery)
(160
)
 
187

Uncollectible accounts written off, net of recoveries
(472
)
 
(120
)
Change due to foreign currency translation
—

 
(2
)
Balance at end of period
$
179

 
$
811
Components of Inventories
The components of inventories are summarized below (in thousands): 
 
September 30,
 
2017
 
2016
Raw materials, parts and subassemblies
$
22,100

 
$
29,639

Work-in-progress
600

 
996

Provision for excess and obsolete inventory
(4,252
)
 
(4,114
)
Total inventories
$
18,448

 
$
26,521
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,
  
2017
 
2016
Costs incurred on uncompleted contracts
$
987,164

 
$
1,088,921

Estimated earnings
316,970

 
350,125

 
1,304,134


1,439,046

Less: Billings to date
(1,278,746
)
 
(1,416,914
)
Net underbilled position
$
25,388

 
$
22,132

Included in the accompanying balance sheets under the following captions:
 
 
 
Costs and estimated earnings in excess of billings on uncompleted contracts – underbilled
$
51,554

 
$
66,106

Billings in excess of costs and estimated earnings on uncompleted contracts – overbilled
(26,166
)
 
(43,974
)
Net underbilled position
$
25,388

 
$
22,132
Schedule of Property, Plant and Equipment
Property, plant and equipment are summarized below (in thousands): 
 
September 30,
 
Range of
 
2017
 
2016
 
Asset Lives
Land
$
22,441

 
$
22,107

 
—
Buildings and improvements
121,960

 
119,512

 
3 - 39 Years
Machinery and equipment
106,113

 
103,268

 
3 - 15 Years
Furniture and fixtures
3,806

 
3,806

 
3 - 10 Years
Construction in process
1,749

 
1,009

 
—
 
$
256,069

 
$
249,702

 
 
Less: Accumulated depreciation
(116,649
)
 
(104,725
)
 
 
Total property, plant and equipment, net
$
139,420

 
$
144,977

 
 
Activity in Warranty Accrual
Activity in our warranty accrual consisted of the following (in thousands): 
 
September 30,
 
2017
 
2016
Balance at beginning of period
$
4,639

 
$
4,930

Increase to warranty expense
1,806

 
4,249

Deduction for warranty charges
(3,314
)
 
(4,464
)
Change due to foreign currency translation
43

 
(76
)
Balance at end of period
$
3,174

 
$
4,639