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Segment Information - Operations and Identifiable Assets (Details) $ in Thousands	3 Months Ended		12 Months Ended	15 Months Ended
	Sep. 30, 2021 USD ($) segment customer	Sep. 30, 2020 USD ($)	Jun. 30, 2021 USD ($) customer	Sep. 30, 2021 USD ($) customer
Operations and identifiable assets by industry segment
Number of identifiable industry segments | segment	3
Total revenues	$ 279,257	$ 254,908
Income (loss) from operations	24,680	16,693
Segments assets	$ 1,410,639		$ 1,384,367	$ 1,410,639
Number of major customers | customer	0		0	0
One customer | Accounts receivable | Customer Concentration Risk
Operations and identifiable assets by industry segment
Concentration (as a percent)	10.00%
International customers | Revenue | Customer Concentration Risk
Operations and identifiable assets by industry segment
Concentration (as a percent)				10.00%
Operating Segments | Security Division
Operations and identifiable assets by industry segment
Total revenues	$ 149,517	134,775
Income (loss) from operations	21,593	8,906
Segments assets	806,025		$ 798,192	$ 806,025
Operating Segments | Healthcare Division
Operations and identifiable assets by industry segment
Total revenues	50,588	51,503
Income (loss) from operations	5,920	8,984
Segments assets	220,818		220,411	220,818
Operating Segments | Optoelectronics and Manufacturing Division
Operations and identifiable assets by industry segment
Total revenues	92,305	79,914
Income (loss) from operations	9,783	8,740
Segments assets	295,684		282,039	295,684
Corporate
Operations and identifiable assets by industry segment
Income (loss) from operations	(12,463)	(9,456)
Segments assets	125,102		121,293	125,102
Eliminations
Operations and identifiable assets by industry segment
Total revenues	(13,153)	(11,284)
Income (loss) from operations	(153)	$ (481)
Segments assets	$ (36,990)		$ (37,568)	$ (36,990)

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