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Acquisitions (Details) $ in Thousands, € in Millions, £ in Millions |  |  |  |  |  |  | 3 Months Ended
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Nov. 28, 2017 USD ($) | Mar. 01, 2017 USD ($) | Mar. 01, 2017 GBP (£) | Feb. 28, 2017 USD ($) | Jan. 13, 2017 USD ($) | Jan. 13, 2017 GBP (£) | Jan. 03, 2017 USD ($) | Jan. 03, 2017 EUR (€) | Nov. 30, 2016 USD ($) | Nov. 30, 2016 GBP (£) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($)
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Acquisition price |  |  |  |  |  |  |  |  |  |  | $ 85,964 | $ 10,733
Compass Engineering Group, Inc |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Acquisition price | $ 49,793 |  |  |  |  |  |  |  |  |  |  |
Additional Acquisitions |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Acquisition price |  |  |  |  |  |  |  |  |  |  | $ 36,171 |
GJ Creative Limited |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Acquisition price |  | $ 37,596 | £ 30.5 |  |  |  |  |  |  |  |  |
RAF Technology, Inc. |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Acquisition price |  |  |  | $ 8,717 |  |  |  |  |  |  |  |
VCG (Holdings) Limited |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Acquisition price |  |  |  |  | $ 10,695 | £ 8.8 |  |  |  |  |  |
Ungricht |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Acquisition price |  |  |  |  |  |  | $ 25,185 | € 24.0 |  |  |  |
Guidance Automation Limited |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Acquisition price |  |  |  |  |  |  |  |  | $ 9,974 | £ 8.0 |  |

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