Basis of Presentation and Significant Accounting Policies - Government Services (Details) - Disposed of by sale, not discontinued operations - Government Services - USD ($) $ in Millions |
3 Months Ended | |
|---|---|---|
May 31, 2017 |
Jul. 31, 2017 |
|
| Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] | ||
| Sale of Government Services business, consideration | $ 35.5 | |
| Gain on sale of Government Services business | $ 1.2 |