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Detail of Selected Balance Sheet Accounts | 12 Months Ended
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Sep. 30, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract] |
Detail of Selected Balance Sheet Accounts | Detail of Selected Balance Sheet Accounts 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 |
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 |
Cost and Estimated Earnings 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 |
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 |  |  |
There were no assets under capital lease as of September 30, 2018 or September 30, 2017. Depreciation expense was $12.7 million, $12.4 million and $13.0 million for fiscal years 2018, 2017, and 2016, respectively. 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 |

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- Definition The entire disclosure for supplemental balance sheet disclosures, including descriptions and amounts for assets, liabilities, and equity. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -URI http://asc.fasb.org/topic&trid=2122208 + Details
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