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Supplementary Balance Sheet Information | 12 Months Ended
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Sep. 30, 2022
Organization, Consolidation and Presentation of Financial Statements [Abstract] |
Supplementary Balance Sheet Information | 9. Supplementary Balance Sheet Information The following is a summary of accounts receivable at September 30, 2022 and 2021 (in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | September 30,
​ |  | 2022 |  | 2021
Accounts receivable | ​ | $ | 168,920 | ​ | $ | 124,195
Less allowance for expected credit losses | ​ |  | (5,162) | ​ |  | (4,318)
Accounts receivable, net | ​ | $ | 163,758 | ​ | $ | 119,877
​ ​ The allowance for expected credit losses for the fiscal years ended September 30, 2022, 2021 and 2020 is as follows (in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Balance at | ​ | ​ | ​ | ​ | Reversals of | ​ | Balance at
​ | ​ | Beginning of | ​ | ​ | ​ | ​ | Bad Debt | ​ | End of
Description |  | Period |  | Provisions |  | Expense |  | Period
2022 Allowance for expected credit losses | ​ | $ | 4,318 | ​ | $ | 3,536 | ​ | $ | (2,692) | ​ | $ | 5,162
2021 Allowance for expected credit losses | ​ |  | 7,146 | ​ | ​ | 3,445 | ​ | ​ | (6,273) | ​ | ​ | 4,318
2020 Allowance for expected credit losses | ​ |  | 3,548 | ​ | ​ | 4,600 | ​ | ​ | (1,002) | ​ | ​ | 7,146
​ ​ The following is a summary of inventories at September 30, 2022 and 2021 (in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | September 30,
​ |  | 2022 |  | 2021
Inventories |  | ​ |  |  | ​ |
Raw materials and purchased parts | ​ | $ | 39,685 | ​ | $ | 27,644
Work-in-process | ​ |  | 4,816 | ​ |  | 4,787
Finished goods | ​ |  | 41,043 | ​ |  | 27,967
Total inventories | ​ | $ | 85,544 | ​ | $ | 60,398
​ ​ The activity for excess and obsolete inventory reserves is as follows for the fiscal years ended September 30, 2022, 2021 and 2020 (in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Balance at | ​ | ​ | ​ | ​ | Inventory | ​ | Balance at
​ | ​ | Beginning of | ​ | ​ | ​ | ​ | Disposals and | ​ | End of
Description |  | Period |  | ​ | Provisions |  | Adjustments |  | Period
2022 Reserves for excess and obsolete inventory | ​ | $ | 3,681 |  | $ | 1,752 | ​ | $ | (1,351) | ​ | $ | 4,082
2021 Reserves for excess and obsolete inventory | ​ | ​ | 3,136 |  | ​ | 1,522 | ​ | $ | (977) | ​ | ​ | 3,681
2020 Reserves for excess and obsolete inventory | ​ |  | 3,157 |  | ​ | 1,515 | ​ | ​ | (1,536) | ​ | ​ | 3,136
​ ​ ​ The activity for valuation allowance for deferred tax assets is as follows for the fiscal years ended September 30, 2022, 2021 and 2020 (in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Balance at | ​ | ​ | ​ | ​ | ​ | ​ | Balance at
​ | ​ | Beginning of | ​ | Charged to | ​ | Charged to | ​ | End of
Description |  | Period |  | Income Tax Benefit |  | Other Accounts |  | Period
2022 Valuation allowance for deferred tax assets | ​ | $ | 8,592 | ​ | $ | 1,337 | ​ | $ | (4,002) | ​ | $ | 5,927
2021 Valuation allowance for deferred tax assets | ​ |  | 10,623 | ​ | ​ | (3,247) | ​ | $ | 1,216 | ​ | ​ | 8,592
2020 Valuation allowance for deferred tax assets | ​ |  | 12,843 | ​ | ​ | (2,514) | ​ | ​ | 294 | ​ | ​ | 10,623
​ ​ The Company establishes reserves for estimated cost of product warranties based on historical information. Product warranty reserves are recorded at the time product revenue is recognized, and retrofit accruals are recorded at the time retrofit programs are established. The Company’s warranty obligation is affected by product failure rates, utilization levels, material usage, service delivery costs incurred in correcting a product failure and supplier warranties on parts delivered to the Company. The following is a summary of product warranty and retrofit activity on a gross basis for the fiscal years ended September 30, 2022, 2021 and 2020 (in thousands): ​
​ | ​ | ​ | ​
​ |  | Amount
Balance at September 30, 2019 | ​ | $ | 2,314
Accruals for warranties during the year | ​ |  | 2,779
Costs incurred during the year | ​ |  | (2,882)
Balance at September 30, 2020 | ​ |  | 2,211
Accruals for warranties during the year | ​ |  | 2,300
Costs incurred during the year | ​ |  | (2,181)
Balance at September 30, 2021 | ​ |  | 2,330
Adjustments for acquisitions | ​ |  | 254
Accruals for warranties during the year | ​ |  | 2,438
Costs incurred during the year | ​ |  | (2,132)
Balance at September 30, 2022 | ​ | $ | 2,890
​ ​ ​

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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://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -URI https://asc.fasb.org/topic&trid=2122208 + Details
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