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Detail of Selected Balance Sheet Accounts | 12 Months Ended
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Sep. 30, 2017
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,
| 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 |
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 |
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,
| 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 |
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 |  |  |
There were no assets under capital lease as of September 30, 2017 or September 30, 2016. Depreciation expense was $12.4 million, $13.0 million and $13.1 million for fiscal years 2017, 2016, and 2015, respectively. 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 |

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