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Detail of Selected Balance Sheet Accounts (Tables) | 9 Months Ended
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Jun. 30, 2020
Organization, Consolidation and Presentation of Financial Statements [Abstract] |
Activity in Allowance for Doubtful Accounts Receivable | Activity in our allowance for doubtful accounts consisted of the following (in thousands):
| Three months ended June 30, |  | Nine months ended June 30,
| 2020 |  | 2019 |  | 2020 |  | 2019
Balance at beginning of period | $ | 300 |  |  | $ | 214 |  |  | $ | 301 |  |  | $ | 157 |
Bad debt expense | 136 |  |  | 25 |  |  | 187 |  |  | 126 |
Uncollectible accounts written off, net of recoveries | (2 | ) |  | (31 | ) |  | (57 | ) |  | (74 | )
Change due to foreign currency translation | — |  |  | (3 | ) |  | 3 |  |  | (4 | )
Balance at end of period | $ | 434 |  |  | $ | 205 |  |  | $ | 434 |  |  | $ | 205 |
Components of Inventories | The components of inventories are summarized below (in thousands):
| June 30, 2020 |  | September 30, 2019
Raw materials, parts and sub-assemblies, net | $ | 30,481 |  |  | $ | 28,102 |
Work-in-progress | 1,182 |  |  | 1,100 |
Total inventories | $ | 31,663 |  |  | $ | 29,202 |
Activity in Product Warranty Accrual | Activity in our product warranty accrual consisted of the following (in thousands):
| Three months ended June 30, |  | Nine months ended June 30,
| 2020 |  | 2019 |  | 2020 |  | 2019
Balance at beginning of period | $ | 3,276 |  |  | $ | 2,986 |  |  | $ | 2,946 |  |  | $ | 2,604 |
Increase in warranty expense | 276 |  |  | 945 |  |  | 1,904 |  |  | 2,572 |
Deduction for warranty charges | (555 | ) |  | (754 | ) |  | (1,826 | ) |  | (1,992 | )
Change due to foreign currency translation | 14 |  |  | 3 |  |  | (13 | ) |  | (4 | )
Balance at end of period | $ | 3,011 |  |  | $ | 3,180 |  |  | $ | 3,011 |  |  | $ | 3,180 |

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- Definition Tabular disclosure of allowance for credit loss on financing receivable. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -URI http://asc.fasb.org/extlink&oid=121611835&loc=SL6953423-111524 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=121599337&loc=SL82919249-210447 + Details
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- Definition Tabular disclosure of the carrying amount as of the balance sheet date of merchandise, goods, commodities, or supplies held for future sale or to be used in manufacturing, servicing or production process. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(6)(c)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(6)(b)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(6)(a)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6361739&loc=d3e7789-107766 + Details
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- Definition Tabular disclosure of the changes in the guarantor's aggregate product warranty liability, including the beginning balance of the aggregate product warranty liability, the aggregate reductions in that liability for payments made (in cash or in kind) under the warranty, the aggregate changes in the liability for accruals related to product warranties issued during the reporting period, the aggregate changes in the liability for accruals related to preexisting warranties (including adjustments related to changes in estimates), and the ending balance of the aggregate product warranty liability. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=68068213&loc=d3e12565-110249 + Details
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