Description of Business, Basis of Presentation, and Significant Accounting Policies (Details) - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Aug. 31, 2015	Aug. 31, 2014	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
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	$ 8.8	$ 7.5