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Business Combinations - Explosive Trace Detection (Details) - USD ($) $ in Thousands | Jul. 07, 2017 | Sep. 30, 2018 | Jun. 30, 2018
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Allocation of total consideration to assets acquired and liabilities assumed |  |  |
Goodwill |  | $ 304,717 | $ 292,213
ETD |  |  |
Business Combinations |  |  |
Total purchase price | $ 80,500 |  |
Allocation of total consideration to assets acquired and liabilities assumed |  |  |
Cash and cash equivalents | 4 |  |
Accounts receivable | 15,517 |  |
Inventories | 11,678 |  |
Property and equipment | 1,599 |  |
Intangible assets | 30,370 |  |
Deferred tax assets | 2,738 |  |
Other long-term assets | 297 |  |
Accounts payable | (4,784) |  |
Accrued payroll and related expenses | (2,116) |  |
Deferred revenues - current | (924) |  |
Accrued warranties | (2,068) |  |
Advances from customers | (670) |  |
Other accrued expenses and current liabilities | (1,074) |  |
Deferred revenues - long term | (232) |  |
Net assets acquired | 50,335 |  |
Goodwill | 30,132 |  |
Total consideration | $ 80,467 |  |

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