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ACQUISITION ACTIVITY - Explosive Trace Detection & American Science and Engineering (Details) - USD ($) $ in Thousands | Jul. 07, 2017 | Sep. 09, 2016 | Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2016
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Allocation of total consideration to assets acquired and liabilities assumed |  |  |  |  |
Goodwill |  |  | $ 292,213 | $ 242,129 | $ 122,819
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, net |  |  | 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 |  |
AS&E |  |  |  |  |
Business Combinations |  |  |  |  |
Percentage of ownership acquired |  | 100.00% |  |  |
Total cash merger consideration |  | $ 266,000 |  |  |
Cash on hand to pay down the revolving bank line of credit |  | $ 69,000 |  |  |
Allocation of total consideration to assets acquired and liabilities assumed |  |  |  |  |
Cash and cash equivalents |  |  | 79,195 |  |
Accounts receivable, net |  |  | 24,607 |  |
Inventories |  |  | 27,495 |  |
Other current assets |  |  | 7,450 |  |
Property and equipment |  |  | 5,337 |  |
Intangible assets |  |  | 74,800 |  |
Other long-term assets |  |  | 201 |  |
Accounts payable |  |  | (5,044) |  |
Accrued payroll and related expenses |  |  | (4,723) |  |
Deferred revenues - current |  |  | (11,281) |  |
Advances from customers |  |  | (13,784) |  |
Other accrued expenses and current liabilities |  |  | (7,279) |  |
Deferred revenues - long term |  |  | (3,225) |  |
Deferred income tax liability |  |  | (9,580) |  |
Other non-current liabilities |  |  | (14,004) |  |
Net assets acquired |  |  | 150,165 |  |
Goodwill |  |  | 115,838 |  |
Total consideration |  |  | $ 266,003 |  |

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