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RELATED-PARTY TRANSACTIONS (Details) - ECIL-Rapiscan Security Products Limited - USD ($) $ in Millions | 12 Months Ended
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Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2016
RELATED-PARTY TRANSACTIONS |  |  |
Ownership interest in joint venture (as a percent) | 36.00% |  |
Initial investment | $ 0.1 |  |
Sales to joint venture | 4.6 | $ 10.2 | $ 9.1
Receivables from joint venture | 1.9 | 4.0 |
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% |  |

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