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Acquisition (Details) - USD ($)
$ in Thousands
Oct. 31, 2020
Jun. 28, 2018
Recognized amounts of identifiable assets acquired and liabilities assumed:    
Cash   $ 170
Current assets, other than cash   335
Property, plant and equipment   27
Deferred tax assets   1,445
Other intangible assets   8,545
Other current liabilities   (2,706)
Deferred tax liabilities   (1,445)
Total identifiable net assets acquired   $ 6,371
CM Visual Technology Corp. [Member]    
Recognized amounts of identifiable assets acquired and liabilities assumed:    
Cash $ 7,982  
Current assets, other than cash 2,602  
Property, plant and equipment 1,906  
Other intangible assets 704  
Other current liabilities (3,181)  
Total identifiable net assets acquired 10,013  
Noncontrolling interests (3,333)  
Total consideration transferred, acquisition-date fair value $ 6,680