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Detail of Selected Balance Sheet Accounts - Components of Inventories (Details) - USD ($) $ in Thousands | Jun. 30, 2021 | Sep. 30, 2020
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Organization, Consolidation and Presentation of Financial Statements [Abstract] |  |
Raw materials, parts and sub-assemblies, net | $ 27,325 | $ 27,429
Work-in-progress | 1,072 | 1,539
Total inventories | $ 28,397 | $ 28,968

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