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Segment Information - Operations and Identifiable Assets (Details) $ in Thousands	3 Months Ended		9 Months Ended		21 Months Ended
	Mar. 31, 2021 USD ($)	Mar. 31, 2020 USD ($)	Mar. 31, 2021 USD ($) segment customer	Mar. 31, 2020 USD ($)	Mar. 31, 2021 USD ($) customer	Jun. 30, 2020 USD ($)
Operations and identifiable assets by industry segment
Number of identifiable industry segments | segment			3
Total revenues	$ 283,787	$ 292,883	$ 814,704	$ 889,077
Income (loss) from operations	32,466	23,625	81,517	81,431
Segments assets	1,325,960		$ 1,325,960		$ 1,325,960	$ 1,268,541
Number of major customers | customer					0
Concentration (as a percent)					10.00%
Customer Concentration Risk
Operations and identifiable assets by industry segment
Concentration (as a percent)			10.00%
Accounts receivable | Customer Concentration Risk
Operations and identifiable assets by industry segment
Number of major customers | customer			1
Concentration (as a percent)			13.00%
Operating Segments | Security Division
Operations and identifiable assets by industry segment
Total revenues	151,409	187,076	$ 431,420	578,477
Income (loss) from operations	23,969	24,525	52,651	73,405
Segments assets	751,008		751,008		$ 751,008	758,054
Operating Segments | Healthcare Division
Operations and identifiable assets by industry segment
Total revenues	54,023	45,662	160,421	127,862
Income (loss) from operations	7,333	1,682	25,640	5,793
Segments assets	211,226		211,226		211,226	208,857
Operating Segments | Optoelectronics and Manufacturing Division
Operations and identifiable assets by industry segment
Total revenues	90,278	70,240	257,713	216,684
Income (loss) from operations	10,484	7,309	29,638	25,096
Segments assets	275,976		275,976		275,976	232,408
Corporate
Operations and identifiable assets by industry segment
Income (loss) from operations	(9,078)	(10,161)	(25,895)	(23,578)
Segments assets	126,157		126,157		126,157	109,178
Eliminations
Operations and identifiable assets by industry segment
Total revenues	(11,923)	(10,095)	(34,850)	(33,946)
Income (loss) from operations	(242)	$ 270	(517)	$ 715
Segments assets	$ (38,407)		$ (38,407)		$ (38,407)	$ (39,956)

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