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Stockholders' Equity (Additional Information) (Details 1) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
May. 31, 2014
Aug. 31, 2015
Aug. 31, 2014
Aug. 31, 2013
Feb. 28, 2011
Schedule of Weighted Average Assumptions for Fair Values of Stock Options[Line Items]          
Share options, grants in period   435,000 0 0  
Reversal to stock-based compensation expense   $ 5.2 $ 45.8    
Shares issued under ESPP   1,005,916 1,077,071 902,691  
Common stock, shares issued   246,680,008 243,930,983    
Restricted Stock Awards [Member]          
Schedule of Weighted Average Assumptions for Fair Values of Stock Options[Line Items]          
Unrecognized compensation related to share-based compensation costs   $ 57.4      
Performance goal full achievement   100.00%      
Unrecognized compensation related to share-based compensation costs, weighted average period of recognition   1 year 6 months      
Performance Shares [Member]          
Schedule of Weighted Average Assumptions for Fair Values of Stock Options[Line Items]          
Restricted stock units awarded   1,700,000      
Time-based restricted stock units [Member]          
Schedule of Weighted Average Assumptions for Fair Values of Stock Options[Line Items]          
Award vesting period   3 years      
Restricted stock units awarded   2,800,000      
Minimum | Performance Shares [Member]          
Schedule of Weighted Average Assumptions for Fair Values of Stock Options[Line Items]          
Award vesting period   3 years      
Maximum | Performance Shares [Member]          
Schedule of Weighted Average Assumptions for Fair Values of Stock Options[Line Items]          
Award vesting period   5 years      
Possibility One | Maximum | Performance Shares [Member]          
Schedule of Weighted Average Assumptions for Fair Values of Stock Options[Line Items]          
Award vesting percentage   100.00%      
Possibility Two | Maximum | Performance Shares [Member]          
Schedule of Weighted Average Assumptions for Fair Values of Stock Options[Line Items]          
Award vesting percentage   150.00%      
Employee Stock Purchase Plan [Member]          
Schedule of Weighted Average Assumptions for Fair Values of Stock Options[Line Items]          
Eligibility period for employees to participate in ESPP   90 days      
Maximum percentage of an employees salary that can be used to purchase shares under the ESPP   10.00%      
Percentage for fair market value fixed for pricing   85.00%      
Common stock, shares issued   10,356,908      
Options [Member]          
Schedule of Weighted Average Assumptions for Fair Values of Stock Options[Line Items]          
Total intrinsic value of options exercised   $ 1.0 $ 0.1 $ 1.2  
Unrecognized compensation related to share-based compensation costs   0.0      
Total fair value of options vested   $ 2.8 $ 0.0 $ 0.1  
Employee Stock Option [Member]          
Schedule of Weighted Average Assumptions for Fair Values of Stock Options[Line Items]          
Share options, grants in period   0      
Stock Appreciation Rights [Member]          
Schedule of Weighted Average Assumptions for Fair Values of Stock Options[Line Items]          
Share options, grants in period   400,000      
Aftermarket services (AMS) [Member]          
Schedule of Weighted Average Assumptions for Fair Values of Stock Options[Line Items]          
Awards vesting 200,000        
Stock-based compensation expense accelerated $ 2.4        
Plan 2011          
Schedule of Weighted Average Assumptions for Fair Values of Stock Options[Line Items]          
Maximum aggregate number of shares subject to awards         18,350,000
Plan 2011 | Employee Stock Purchase Plan [Member]          
Schedule of Weighted Average Assumptions for Fair Values of Stock Options[Line Items]          
Maximum aggregate number of shares subject to awards         6,000,000