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SEGMENT INFORMATION - By industry segment (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Jun. 30, 2021
Mar. 31, 2021
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2019
Operations and identifiable assets by industry segment                      
Total revenues $ 332,198 $ 283,787 $ 276,009 $ 254,908 $ 276,967 $ 292,883 $ 305,342 $ 290,852 $ 1,146,902 $ 1,166,044 $ 1,182,115
Income (loss) from operations 33,854 $ 32,466 $ 32,358 $ 16,693 23,456 $ 23,625 $ 32,919 $ 24,887 115,371 104,887 107,774
Segments assets 1,384,367       1,268,541       1,384,367 1,268,541 1,264,864
Capital expenditures                 15,760 20,388 27,412
Depreciation and amortization                 43,855 49,758 56,234
Security Division                      
Operations and identifiable assets by industry segment                      
Total revenues                 633,340 742,043 747,550
Capital expenditures                 3,290 8,648 15,830
Depreciation and amortization                 26,572 34,907 39,788
Healthcare Division                      
Operations and identifiable assets by industry segment                      
Total revenues                 212,315 185,322 188,477
Capital expenditures                 2,144 1,404 1,372
Depreciation and amortization                 5,364 4,390 5,426
Optoelectronics and Manufacturing Division                      
Operations and identifiable assets by industry segment                      
Total revenues                 301,247 238,679 246,088
Capital expenditures                 6,714 6,291 4,760
Depreciation and amortization                 9,325 8,785 9,269
Corporate                      
Operations and identifiable assets by industry segment                      
Income (loss) from operations                 (39,769) (31,630) (30,598)
Segments assets 121,293       109,178       121,293 109,178 79,498
Capital expenditures                 3,612 4,045 5,450
Depreciation and amortization                 2,594 1,676 1,751
Operating Segments | Security Division                      
Operations and identifiable assets by industry segment                      
Total revenues                 633,340 742,043 747,550
Income (loss) from operations                 85,515 90,063 97,426
Segments assets 798,192       758,054       798,192 758,054 793,810
Operating Segments | Healthcare Division                      
Operations and identifiable assets by industry segment                      
Total revenues                 212,315 185,322 188,477
Income (loss) from operations                 31,563 15,766 12,277
Segments assets 220,411       208,857       220,411 208,857 157,639
Operating Segments | Optoelectronics and Manufacturing Division                      
Operations and identifiable assets by industry segment                      
Total revenues                 349,887 283,828 288,630
Income (loss) from operations                 38,465 30,566 29,519
Segments assets 282,039       232,408       282,039 232,408 237,851
Eliminations                      
Operations and identifiable assets by industry segment                      
Total revenues                 (48,640) (45,149) (42,542)
Income (loss) from operations                 (403) 122 (850)
Segments assets $ (37,568)       $ (39,956)       (37,568) (39,956) (3,934)
Eliminations | Optoelectronics and Manufacturing Division                      
Operations and identifiable assets by industry segment                      
Total revenues                 $ 48,640 $ 45,149 $ 42,542