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Accounts Receivable, Net and Unbilled Receivables - Schedule of Accounts Receivable, Net and Unbilled Receivables (Details) - USD ($) $ in Thousands	Apr. 30, 2022	Oct. 31, 2021
Accounts Receivable, Net and Unbilled Receivables
Amount billed	$ 10,881	$ 13,854
Unbilled receivables	8,591	7,175
Commercial customers accounts receivable	19,472	21,029
Advanced Technologies including U.S. government, Amount billed	4,585	876
Advanced Technologies including U.S. government, Unbilled receivables	1,614	1,749
Advanced Technologies including U.S. government, Accounts receivable	6,199	2,625
Accounts receivable, net and unbilled receivables	$ 25,671	$ 23,654

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Advanced technologies including U.S. government, amount billed receivable.

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Commercial customers accounts receivable.

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- Definition

Amount billed to customers under long-term contracts or programs but not paid. Excludes amounts due that have been withheld because of retainage provisions in a contract.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 910
-SubTopic 10
-Section 50
-Paragraph 6
-URI http://asc.fasb.org/extlink&oid=123353855&loc=SL119991595-234733

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Unbilled amounts due for services rendered or to be rendered, actions taken or to be taken, or a promise to refrain from taking certain actions in accordance with the terms of a legally binding agreement between the entity and, at a minimum, one other party. An example would be amounts associated with contracts or programs where the recognized revenue for performance thereunder exceeds the amounts billed under the terms thereof as of the date of the balance sheet.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
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-Publisher FASB
-Name Accounting Standards Codification
-Topic 912
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-Section 45
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