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v3.21.4

Business Segments (Details) $ in Millions | 12 Months Ended
--- | ---
Sep. 30, 2021 USD ($) segment | Sep. 30, 2020 USD ($) | Sep. 30, 2019 USD ($)
Business segments |  |  |
Number of business segments | segment | 1 |  |
Flat Panel Display Systems |  |  |
Geographic Data |  |  |
Concentration Risk Threshold Percentage | 88.00% | 80.00% | 90.00%
Foreign Countries |  |  |
Geographic Data |  |  |
Net sales from outside the United States | $ | $ 8.4 | $ 9.4 | $ 7.5

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- Definition Number of operating segments. An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=123359005&loc=d3e8672-108599 + Details
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- Definition Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. 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