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SEGMENT INFORMATION - By industry segment (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Jun. 30, 2022
Mar. 31, 2022
Dec. 31, 2021
Sep. 30, 2021
Jun. 30, 2021
Mar. 31, 2021
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2020
Operations and identifiable assets by industry segment                      
Total revenues $ 336,821 $ 290,477 $ 276,681 $ 279,257 $ 332,198 $ 283,787 $ 276,009 $ 254,908 $ 1,183,236 $ 1,146,902 $ 1,166,044
Income (loss) from operations 39,557 $ 28,426 $ 29,086 $ 24,680 33,854 $ 32,466 $ 32,358 $ 16,693 121,749 115,371 104,887
Segments assets 1,443,150       1,384,367       1,443,150 1,384,367 1,268,541
Capital expenditures                 14,921 15,760 20,388
Depreciation and amortization                 38,679 43,855 49,758
Security                      
Operations and identifiable assets by industry segment                      
Total revenues                 663,159 633,340 742,043
Capital expenditures                 5,513 3,290 8,648
Depreciation and amortization                 22,970 26,572 34,907
Healthcare Division                      
Operations and identifiable assets by industry segment                      
Total revenues                 205,658 212,315 185,322
Capital expenditures                 2,295 2,144 1,404
Depreciation and amortization                 5,915 5,364 4,390
Optoelectronics and Manufacturing Division                      
Operations and identifiable assets by industry segment                      
Total revenues                 314,419 301,247 238,679
Capital expenditures                 4,533 6,714 6,291
Depreciation and amortization                 8,098 9,325 8,785
Corporate.                      
Operations and identifiable assets by industry segment                      
Income (loss) from operations                 (46,950) (39,769) (31,630)
Segments assets 104,834       121,293       104,834 121,293 109,178
Capital expenditures                 2,580 3,612 4,045
Depreciation and amortization                 1,696 2,594 1,676
Operating Segments | Security                      
Operations and identifiable assets by industry segment                      
Total revenues                 663,159 633,340 742,043
Income (loss) from operations                 98,784 85,515 90,063
Segments assets 839,769       798,192       839,769 798,192 758,054
Operating Segments | Healthcare Division                      
Operations and identifiable assets by industry segment                      
Total revenues                 205,658 212,315 185,322
Income (loss) from operations                 24,696 31,563 15,766
Segments assets 231,423       220,411       231,423 220,411 208,857
Operating Segments | Optoelectronics and Manufacturing Division                      
Operations and identifiable assets by industry segment                      
Total revenues                 366,661 349,887 283,828
Income (loss) from operations                 45,030 38,465 30,566
Segments assets 301,483       282,039       301,483 282,039 232,408
Eliminations                      
Operations and identifiable assets by industry segment                      
Total revenues                 (52,242) (48,640) (45,149)
Income (loss) from operations                 189 (403) 122
Segments assets $ (34,359)       $ (37,568)       (34,359) (37,568) (39,956)
Eliminations | Optoelectronics and Manufacturing Division                      
Operations and identifiable assets by industry segment                      
Total revenues                 $ 52,242 $ 48,640 $ 45,149