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Segment Information - Operations and Identifiable Assets (Details)
$ in Thousands
 3 Months Ended 12 Months Ended
Sep. 30, 2023
USD ($)
segment
customer
Sep. 30, 2022
USD ($)
customer
Jun. 30, 2023
USD ($)
customer
Segment Information      
Number of identifiable industry segments | segment 3    
Total revenues $ 279,210 $ 268,071  
Income (loss) from operations 22,559 $ 18,300  
Segments assets $ 1,588,452   $ 1,555,686
Number of major customers | customer 0 0 0
One customer. | Accounts receivable | Customer      
Segment Information      
Concentration (as a percent) 10.00%   10.00%
International customers | Revenues | Customer      
Segment Information      
Concentration (as a percent) 10.00% 10.00%  
Operating segments | Security division      
Segment Information      
Total revenues $ 164,629 $ 144,992  
Income (loss) from operations 20,609 14,924  
Segments assets 987,134   $ 948,126
Operating segments | Optoelectronics And Manufacturing Division      
Segment Information      
Total revenues 96,128 93,915  
Income (loss) from operations 11,437 11,258  
Segments assets 296,328   310,930
Operating segments | Healthcare division      
Segment Information      
Total revenues 37,787 43,563  
Income (loss) from operations 164 1,628  
Segments assets 238,897   245,856
Corporate      
Segment Information      
Income (loss) from operations (9,916) (10,178)  
Segments assets 113,252   94,678
Intersegment revenue elimination      
Segment Information      
Total revenues (19,334) (14,399)  
Income (loss) from operations 265 $ 668  
Segments assets $ (47,159)   $ (43,904)