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RELATED-PARTY TRANSACTIONS (Details) - ECIL-Rapiscan Security Products Limited - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 1994
RELATED-PARTY TRANSACTIONS |  |  |  |
Ownership interest in joint venture (as a percent) |  |  |  | 36.00%
Initial investment |  |  |  | $ 0.1
Sales to joint venture | $ 2.4 | $ 2.3 | $ 4.0 |
Receivables from joint venture | 0.5 | 0.3 |  |
Maximum |  |  |  |
RELATED-PARTY TRANSACTIONS |  |  |  |
Equity earnings in joint venture | $ 0.1 | $ 0.1 | $ 0.1 |
Chairman and Chief Executive Officer |  |  |  |
RELATED-PARTY TRANSACTIONS |  |  |  |
Related party ownership percentage in equity method investee of the reporting entity |  |  |  | 10.50%
Executive Vice President and President of the Company's Security division |  |  |  |
RELATED-PARTY TRANSACTIONS |  |  |  |
Related party ownership percentage in equity method investee of the reporting entity |  |  |  | 4.50%
Chairman and Chief Executive Officer, and Executive Vice President and Director 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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