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Business Combinations - Revenue and Income (Details) - Explosive Trace Detection Business ("ETD") - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2017 | Dec. 31, 2016
Business Combinations |  |  |  |  |
Amount included in revenue | $ 19,700 |  | $ 41,400 |  |
Amount included in pre-tax income | 2,600 |  | $ 6,600 |  |
Pro forma results of operations assume the AS&E acquisition had occurred on July 1, 2016 |  |  |  |  |
Revenues | 277,528 | $ 266,167 |  | $ 534,661 | $ 502,918
Income (loss) before taxes | $ 18,147 | $ 13,328 |  | $ 37,541 | $ 17,769

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