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Discontinued Operations (Details2) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Feb. 29, 2016 | May 31, 2017 | May 31, 2016 | May 31, 2015
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Working capital adjustment | $ 2.9 |  |  |  |  |
Discontinued Operations [Member] |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Revenues |  | $ 0.4 | $ 0.8 |  | $ 229.1 |
Operating costs and expenses |  | 0.9 | 2.7 |  | 223.3 |
Interest income (expense) |  | 0.1 | 0.1 |  | 0.1 |
Gain (loss) on sale |  |  | (2.9) |  | 454.0 |
Earnings (loss) before income taxes |  | (0.4) | (4.7) |  | 459.9 |
Provision (benefit) for income taxes |  | (0.2) | (1.2) |  | 180.8 |
Earnings (loss) from discontinued operations, net of tax |  | (0.2) | (3.5) |  | 279.1 |
Discontinued Operations [Member] | ED Tech [Member] |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Revenues |  | 0.0 | 0.0 |  | 217.4 |
Operating costs and expenses |  | 0.8 | 1.5 | [1] | 208.8 | [2]
Interest income (expense) |  | 0.0 | 0.0 |  | 0.0 |
Gain (loss) on sale |  |  | (2.9) |  | 454.0 |
Earnings (loss) before income taxes |  | (0.8) | (4.4) |  | 462.6 |
Provision (benefit) for income taxes |  | (0.3) | (1.1) |  | 181.8 |
Earnings (loss) from discontinued operations, net of tax |  | (0.5) | (3.3) |  | 280.8 |
Unabsorbed overhead |  |  | 15.8 |  |  |
Discontinued Operations [Member] | All Other [Member] |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Revenues |  | 0.4 | 0.8 |  | 11.7 |
Operating costs and expenses |  | 0.1 | 1.2 |  | 14.5 |
Interest income (expense) |  | 0.1 | 0.1 |  | 0.1 |
Gain (loss) on sale |  |  | 0.0 |  | 0.0 |
Earnings (loss) before income taxes |  | 0.4 | (0.3) |  | (2.7) |
Provision (benefit) for income taxes |  | 0.1 | (0.1) |  | (1.0) |
Earnings (loss) from discontinued operations, net of tax |  | $ 0.3 | $ (0.2) |  | $ (1.7) |
[1] | Gain (loss) on sale included the finalization of the working capital adjustments from the sale of the Ed Tech business, resulting in a payment to the purchaser of $2.9.
[2] | Operating costs and expenses included costs related to unabsorbed overhead burden associated with the former educational technology and services business of $15.8.

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