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Description of Business, Basis of Presentation, and Significant Accounting Policies (Details) - USD ($) $ in Millions | 2 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Feb. 29, 2016 | Feb. 29, 2016 | Feb. 28, 2015 | Feb. 29, 2016 | Feb. 28, 2015 | May. 31, 2015 | Dec. 31, 2014
Description of Business, Basis of Presentation, and Significant Accounting Policies (Textual) |  |  |  |  |  |  |
Disclosure on geographic areas, Description of revenue from external customers |  |  |  | revenue within Germany, which represented less than one percent of the Company's total revenue | revenue within Germany, which represented less than one percent of the Company's total revenue |  |
Disclosure on geographic areas, Long-lived assets |  |  |  | Long-lived assets in Germany are insignificant in relation to total long-lived assets of the Company |  | Long-lived assets in Germany are insignificant in relation to total long-lived assets of the Company |
Allowance for doubtful accounts | $ 4.1 | $ 4.1 |  | $ 4.1 |  | $ 1.4 |
Trade accounts receivable, net | 175.4 | 175.4 |  | 175.4 |  | 176.6 |
Purchased accounts receivable, net | 178.0 | 178.0 |  | 178.0 |  |  |
Maximum individual workers' compensation claims liability |  |  |  | 1.3 |  | $ 1.0 |
Maximum individual claims liability health insurance | $ 0.3 |  |  |  |  |  | $ 0.3
Stock-based compensation costs recognized |  | $ 8.6 | $ 8.6 | $ 26.1 | $ 24.0 |  |

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