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RELATED-PARTY TRANSACTIONS (Details) - USD ($) $ in Millions	12 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 1994
ECIL-Rapiscan Security Products Limited
RELATED-PARTY TRANSACTIONS
Sales to joint venture	$ 6.9	$ 2.3	$ 2.4
ECIL-Rapiscan Security Products Limited
RELATED-PARTY TRANSACTIONS
Ownership interest in joint venture (as a percent)				36.00%
Initial investment				$ 0.1
Receivables from joint venture	1.9	0.6
ECIL-Rapiscan Security Products Limited | Maximum
RELATED-PARTY TRANSACTIONS
Equity earnings in joint venture	$ 0.1	$ 0.1	$ 0.1
ECIL-Rapiscan Security Products Limited | Chairman and Chief Executive Officer
RELATED-PARTY TRANSACTIONS
Related party ownership percentage in equity method investee of the reporting entity				10.50%
ECIL-Rapiscan Security Products Limited | One of Executive Vice Presidents
RELATED-PARTY TRANSACTIONS
Related party ownership percentage in equity method investee of the reporting entity				4.50%
ECIL-Rapiscan Security Products Limited | Chairman and Chief Executive Officer, and Executive Vice President and President of the Company's Security division | Maximum
RELATED-PARTY TRANSACTIONS
Collective voting power control, by entity and related parties, in equity method investment of entity (as a percent)	50.00%	50.00%	50.00%

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