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Customer Contracts (Details Textual) - USD ($) $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Jun. 30, 2015 | Jun. 30, 2017 | Jun. 30, 2016
Business Acquisition [Line Items] |  |  |
Contract Receivable Retainage, Next Twelve Months |  | $ 54.3 | $ 29.7
Contract Receivable Retainage, after Next Twelve Months |  | 1.9 | 0.3
Retention Payable |  | $ 12.6 | $ 14.9
Change In Accounting Estimate, Financial Effect, Operating Income | $ 53.4 |  |
Change in Accounting Estimate, Financial Effect, Net Income | 18.3 |  |

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