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Detail of Selected Balance Sheet Accounts | 12 Months Ended
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Sep. 30, 2019
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,
| 2019 |  | 2018
Balance at beginning of period | $ | 157 |  |  | $ | 179 |
Bad debt expense | 233 |  |  | 111 |
Uncollectible accounts written off, net of recoveries | (81 | ) |  | (125 | )
Change due to foreign currency translation | (8 | ) |  | (8 | )
Balance at end of period | $ | 301 |  |  | $ | 157 |
Inventories The components of inventories are summarized below (in thousands):
| September 30,
| 2019 |  | 2018
Raw materials, parts and subassemblies | $ | 31,781 |  |  | $ | 24,563 |
Work-in-progress | 1,100 |  |  | 1,080 |
Provision for excess and obsolete inventory | (3,679 | ) |  | (4,291 | )
Total inventories | $ | 29,202 |  |  | $ | 21,352 |
Property, Plant and Equipment Property, plant and equipment are summarized below (in thousands):
| September 30, |  | Range of
| 2019 |  | 2018 |  | Asset Lives
Land | $ | 21,963 |  |  | $ | 22,207 |  |  | —
Buildings and improvements | 122,404 |  |  | 123,320 |  |  | 3 - 39 Years
Machinery and equipment | 106,137 |  |  | 104,542 |  |  | 3 - 15 Years
Furniture and fixtures | 3,611 |  |  | 3,799 |  |  | 3 - 10 Years
Construction in process | 2,118 |  |  | 357 |  |  | —
| $ | 256,233 |  |  | $ | 254,225 |  |  |
Less: Accumulated depreciation | (135,421 | ) |  | (125,461 | ) |  |
Total property, plant and equipment, net | $ | 120,812 |  |  | $ | 128,764 |  |  |
There were no assets under capital lease as of September 30, 2019 or September 30, 2018. Depreciation expense was $11.9 million, $12.7 million and $12.4 million for fiscal years 2019, 2018, and 2017, respectively. Accrued Product Warranty Activity in our product warranty accrual consisted of the following (in thousands):
| September 30,
| 2019 |  | 2018
Balance at beginning of period | $ | 2,604 |  |  | $ | 3,174 |
Increase to warranty expense | 3,004 |  |  | 2,031 |
Deduction for warranty charges | (2,649 | ) |  | (2,574 | )
Change due to foreign currency translation | (13 | ) |  | (27 | )
Balance at end of period | $ | 2,946 |  |  | $ | 2,604 |

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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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