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Business Combinations (Narrative) (Details) - USD ($) $ in Thousands | 3 Months Ended
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Dec. 31, 2018 | Jun. 30, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Dec. 31, 2016 | Jun. 30, 2016
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |
GOODWILL | $ 100,722 |  | $ 55,831 |  |  | $ 19,828 |
Genesis |  |  |  |  |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |
Ownership percentage acquired | 100.00% |  |  |  |  |  |
Purchase price | $ 107,539 |  |  |  |  |  |
Escrow deposit | 3,350 |  |  |  |  |  |
GOODWILL | 45,236 |  |  |  |  |  |
Genesis | Customer Relationships |  |  |  |  |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |
Intangible assets acquired | $ 32,350 |  |  |  |  |  |
Acquired intangible asset, useful life | 11 years |  |  |  |  |  |
Genesis | Technology, trademark, tradename |  |  |  |  |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |
Intangible assets acquired | $ 11,350 |  |  |  |  |  |
Acquired intangible asset, useful life | 6 years |  |  |  |  |  |
RC |  |  |  |  |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |
Ownership percentage acquired |  | 100.00% |  |  |  |  |
Purchase price |  | $ 4,453 |  |  |  |  |
GOODWILL |  | 4,072 |  |  |  |  |
RC | Customer Relationships |  |  |  |  |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |
Intangible assets acquired |  | $ 111 |  |  |  |  |
Acquired intangible asset, useful life |  | 1 year |  |  |  |  |
RC | Technology, trademark, tradename |  |  |  |  |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |
Intangible assets acquired |  | $ 594 |  |  |  |  |
Acquired intangible asset, useful life |  | 10 years |  |  |  |  |
LDD |  |  |  |  |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |
Ownership percentage acquired |  |  | 100.00% |  |  |  |
Purchase price |  |  | $ 9,992 |  |  |  |
GOODWILL |  |  | 5,276 |  |  |  |
LDD | Customer Relationships |  |  |  |  |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |
Intangible assets acquired |  |  | $ 1,006 |  |  |  |
Acquired intangible asset, useful life |  |  | 6 years |  |  |  |
LDD | Technology, trademark, tradename |  |  |  |  |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |
Intangible assets acquired |  |  | $ 2,608 |  |  |  |
Acquired intangible asset, useful life |  |  | 6 years |  |  |  |
ILT |  |  |  |  |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |
Ownership percentage acquired |  |  |  | 100.00% |  |  |
Purchase price |  |  |  | $ 40,256 |  |  |
GOODWILL |  |  |  | 19,467 |  |  |
ILT | Customer Relationships |  |  |  |  |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |
Intangible assets acquired |  |  |  | $ 11,660 |  |  |
Acquired intangible asset, useful life |  |  |  | 13 years |  |  |
ILT | Technology, trademark, tradename |  |  |  |  |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |
Intangible assets acquired |  |  |  | $ 7,480 |  |  |
Acquired intangible asset, useful life |  |  |  | 8 years |  |  |
OptiGrate |  |  |  |  |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |
Ownership percentage acquired |  |  |  |  | 100.00% |  |
Purchase price |  |  |  |  | $ 16,870 |  |
GOODWILL |  |  |  |  | 8,900 |  |
OptiGrate | Customer Relationships |  |  |  |  |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |
Intangible assets acquired |  |  |  |  | $ 1,010 |  |
Acquired intangible asset, useful life |  |  |  |  | 4 years |  |
OptiGrate | Technology, trademark, tradename |  |  |  |  |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |
Intangible assets acquired |  |  |  |  | $ 4,650 |  |
Acquired intangible asset, useful life |  |  |  |  | 9 years |  |
BSI |  |  |  |  |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |
Purchase price |  |  |  |  |  | 1,481 |
Intangible assets acquired |  |  |  |  |  | $ 1,395 |
Acquired intangible asset, useful life |  |  |  |  |  | 7 years |
GOODWILL |  |  |  |  |  | $ 0 |
Menara |  |  |  |  |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |
Purchase price |  |  |  |  |  |  | $ 46,831
GOODWILL |  |  |  |  |  |  | 19,325
Menara | Customer Relationships |  |  |  |  |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |
Intangible assets acquired |  |  |  |  |  |  | $ 9,500
Acquired intangible asset, useful life |  |  |  |  |  |  | 10 years
Menara | Technology, trademark, tradename |  |  |  |  |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |
Intangible assets acquired |  |  |  |  |  |  | $ 9,900
Acquired intangible asset, useful life |  |  |  |  |  |  | 7 years

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