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Segment Information - Operations and Identifiable Assets (Details)
$ in Thousands
 3 Months Ended 9 Months Ended 12 Months Ended
Mar. 31, 2022
USD ($)
customer
Mar. 31, 2021
USD ($)
customer
Mar. 31, 2022
USD ($)
customer
segment
Mar. 31, 2021
USD ($)
customer
Jun. 30, 2021
USD ($)
customer
Operations and identifiable assets by industry segment          
Number of identifiable industry segments | segment     3    
Total revenues $ 290,477 $ 283,787 $ 846,415 $ 814,704  
Income (loss) from operations 28,426 $ 32,466 82,192 $ 81,517  
Segments assets $ 1,459,091   $ 1,459,091   $ 1,384,367
Number of major customers | customer 0 0 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% 10.00% 10.00%  
Operating Segments | Security          
Operations and identifiable assets by industry segment          
Total revenues $ 158,644 $ 151,409 $ 454,079 $ 431,420  
Income (loss) from operations 20,559 23,969 60,323 52,651  
Segments assets 847,050   847,050   $ 798,192
Operating Segments | Healthcare Division          
Operations and identifiable assets by industry segment          
Total revenues 52,178 54,023 155,191 160,421  
Income (loss) from operations 7,480 7,333 20,430 25,640  
Segments assets 232,850   232,850   220,411
Operating Segments | Optoelectronics and Manufacturing Division          
Operations and identifiable assets by industry segment          
Total revenues 92,122 90,278 275,917 257,713  
Income (loss) from operations 11,177 10,484 34,342 29,638  
Segments assets 299,059   299,059   282,039
Corporate          
Operations and identifiable assets by industry segment          
Income (loss) from operations (10,729) (9,078) (32,855) (25,895)  
Segments assets 115,531   115,531   121,293
Eliminations          
Operations and identifiable assets by industry segment          
Total revenues (12,467) (11,923) (38,772) (34,850)  
Income (loss) from operations (61) $ (242) (48) $ (517)  
Segments assets $ (35,399)   $ (35,399)   $ (37,568)