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Segment Information - By industry segment (Details)
$ in Thousands
 3 Months Ended 9 Months Ended
Mar. 31, 2026
USD ($)
Mar. 31, 2025
USD ($)
customer
Mar. 31, 2026
USD ($)
segment
Mar. 31, 2025
USD ($)
customer
Segment Information        
Number of reporting segments | segment     3  
Number of identifiable industry segments | segment     3  
Total revenues $ 453,246 $ 444,354 $ 1,301,926 $ 1,208,181
Cost of goods sold 302,922 294,063 876,788 789,237
Selling, general and administrative expenses 71,487 73,249 208,643 216,194
Research and development expenses 19,455 18,570 59,641 54,600
Segment income (loss) from operations 59,382 58,472 156,854 148,150
Impairment, restructuring and other charges 6,168 2,255 11,772 3,648
Income (loss) from operations 53,214 56,217 145,082 144,502
Capital expenditures 7,559 4,518 21,272 17,713
Depreciation and amortization 9,522 10,567 29,388 32,664
Security Division        
Segment Information        
Total revenues 319,263 314,908 908,216 829,209
Optoelectronics and Manufacturing Division        
Segment Information        
Total revenues 93,282 85,724 275,732 253,294
Healthcare Division        
Segment Information        
Total revenues 40,701 $ 43,722 117,978 $ 125,678
Revenues | Security Division | One customer | Customer        
Segment Information        
Number of major customers | customer   1   1
Concentration (as a percent)   14.00%   13.00%
Operating segments | Security Division        
Segment Information        
Total revenues 319,263 $ 314,908 908,216 $ 829,209
Cost of goods sold 213,141 209,498 612,645 536,651
Selling, general and administrative expenses 37,172 39,499 111,339 118,121
Research and development expenses 13,546 13,003 41,104 38,141
Segment income (loss) from operations 55,404 52,908 143,128 136,296
Impairment, restructuring and other charges 1,433 1,403 5,087 1,882
Income (loss) from operations 53,971 51,505 138,041 134,414
Capital expenditures 5,681 1,787 13,432 10,945
Depreciation and amortization 6,217 7,262 19,466 22,001
Operating segments | Optoelectronics and Manufacturing Division        
Segment Information        
Total revenues 110,998 100,860 333,011 299,398
Cost of goods sold 87,219 77,926 262,087 233,921
Selling, general and administrative expenses 7,884 7,942 25,596 24,443
Research and development expenses 1,282 1,270 3,795 3,874
Segment income (loss) from operations 14,613 13,722 41,533 37,160
Impairment, restructuring and other charges   72 261 619
Income (loss) from operations 14,613 13,650 41,272 36,541
Capital expenditures 834 1,234 4,228 3,299
Depreciation and amortization 1,790 1,629 5,191 5,513
Operating segments | Healthcare Division        
Segment Information        
Total revenues 40,701 43,722 117,978 125,678
Cost of goods sold 20,167 21,663 58,048 63,801
Selling, general and administrative expenses 15,637 15,827 42,480 44,683
Research and development expenses 4,627 4,297 14,742 12,585
Segment income (loss) from operations 270 1,935 2,708 4,609
Impairment, restructuring and other charges 2,636 627 4,325 779
Income (loss) from operations (2,366) 1,308 (1,617) 3,830
Capital expenditures 690 132 2,226 690
Depreciation and amortization 1,040 1,269 3,277 3,945
Intersegment revenue elimination        
Segment Information        
Total revenues (17,716) (15,136) (57,279) (46,104)
Intersegment revenue elimination | Optoelectronics and Manufacturing Division        
Segment Information        
Total revenues 17,716 15,136 57,279 46,104
Corporate/ Eliminations        
Segment Information        
Total revenues (17,716) (15,136) (57,279) (46,104)
Cost of goods sold (17,605) (15,024) (55,992) (45,136)
Selling, general and administrative expenses 10,794 9,981 29,228 28,947
Segment income (loss) from operations (10,905) (10,093) (30,515) (29,915)
Impairment, restructuring and other charges 2,099 153 2,099 368
Income (loss) from operations (13,004) (10,246) (32,614) (30,283)
Capital expenditures 354 1,365 1,386 2,779
Depreciation and amortization $ 475 $ 407 $ 1,454 $ 1,205