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Segment Information - Operations and Identifiable Assets (Details)
$ in Thousands
 3 Months Ended 12 Months Ended
Sep. 30, 2022
USD ($)
segment
customer
Sep. 30, 2021
USD ($)
customer
Jun. 30, 2022
USD ($)
customer
Operations and identifiable assets by industry segment      
Number of identifiable industry segments | segment 3    
Total revenues $ 268,071 $ 279,257  
Income (loss) from operations 18,300 24,680  
Segments assets $ 1,467,767 $ 1,443,150 $ 1,443,150
Number of major customers | customer 0 0 0
One customer | Accounts receivable | Customer      
Operations and identifiable assets by industry segment      
Concentration (as a percent) 10.00%   10.00%
International customers | Revenues | Customer      
Operations and identifiable assets by industry segment      
Concentration (as a percent) 10.00% 10.00%  
Operating Segments | Security Division      
Operations and identifiable assets by industry segment      
Total revenues $ 144,992 $ 149,517  
Income (loss) from operations 14,924 21,593  
Segments assets 866,652 839,769  
Operating Segments | Healthcare Division      
Operations and identifiable assets by industry segment      
Total revenues 43,563 50,588  
Income (loss) from operations 1,628 5,920  
Segments assets 225,182 231,423  
Operating Segments | Optoelectronics and Manufacturing Division      
Operations and identifiable assets by industry segment      
Total revenues 93,915 92,305  
Income (loss) from operations 11,258 9,783  
Segments assets 315,029 301,483  
Corporate      
Operations and identifiable assets by industry segment      
Income (loss) from operations (10,178) (12,463)  
Segments assets 96,071 104,834  
Intersegment Eliminations      
Operations and identifiable assets by industry segment      
Total revenues (14,399) (13,153)  
Income (loss) from operations 668 (153)  
Segments assets $ (35,167) $ (34,359)