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Acquisitions (Detail Textual) - USD ($) $ in Thousands | Aug. 15, 2018 | Dec. 31, 2018 | Jun. 30, 2018 | Jun. 30, 2017
--- | --- | --- | --- | ---
Business Acquisition [Line Items] |  |  |  |
Goodwill |  | $ 2,659,749 | $ 2,620,835 | $ 2,577,435
Domestic Acquisition | SE&A BU |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Acquisition date | Aug. 15, 2018 |  |  |
Cash consideration | $ 84,000 |  |  |
Consideration, initial net working capital payment | 6,000 |  |  |
Goodwill | 42,600 |  |  |
Identifiable intangible assets | $ 8,900 |  |  |

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- Definition Date when the acquirer obtains control of the acquiree, in CCYY-MM-DD format. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 25 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=84229725&loc=d3e848-128460 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 25 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=84229725&loc=d3e845-128460 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463 + Details
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