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Restructuring (Details) $ in Millions |  | 12 Months Ended
--- | --- | ---
Dec. 05, 2013 USD ($) Employees | May 31, 2016 USD ($) | May 31, 2015 USD ($)
Operational Excellence Program |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Period of restructuring plan | 3 years |  |
Expected restructuring costs | $ 4.9 |  |
Restructuring costs incurred to date |  | $ 1.5 | $ 2.0
Accelerated depreciation due to restructuring |  | 1.0 | 1.5
Profitability Improvement Plan |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Accelerated depreciation due to restructuring |  | 1.9 | 0.8
Gain related to the modification of stock based compensation |  | 0.7 |
Severance | Operational Excellence Program |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring costs incurred to date |  | $ 0.5 | $ 0.5
Minimum |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Expected number of positions (employee) | Employees | 80,000 |  |
Minimum | Operational Excellence Program |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Expected future saving | $ 15.0 |  |
Maximum |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Expected number of positions (employee) | Employees | 100,000 |  |
Maximum | Operational Excellence Program |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Expected future saving | $ 18.0 |  |
Facility Improvements | Operational Excellence Program |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Expected restructuring costs | $ 5.4 |  |

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