XML 100 R85.htm IDEA: XBRL DOCUMENT v3.8.0.1
Stockholders' Equity (Additional Information) (Details 3) - USD ($)
$ in Millions
12 Months Ended
Aug. 31, 2017
Aug. 31, 2016
Schedule of Weighted Average Assumptions for Fair Values of Stock Options[Line Items]    
Shares available for issuance under share based compensation plan 12,228,936 4,898,739
2016 Share Repurchase Program [Member]    
Schedule of Weighted Average Assumptions for Fair Values of Stock Options[Line Items]    
Share repurchase program, amount authorized $ 400.0  
Share repurchase program, remaining authorized repurchase amount 400.0  
2017 Share Repurchase Program [Member]    
Schedule of Weighted Average Assumptions for Fair Values of Stock Options[Line Items]    
Share repurchase program, amount authorized 450.0  
Share repurchase program, remaining authorized repurchase amount $ 449.9  
Performance-based restricted stock units [Member]    
Schedule of Weighted Average Assumptions for Fair Values of Stock Options[Line Items]    
Restricted stock units awarded 600,000  
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 1,800,000  
Market based restricted stock units [Member]    
Schedule of Weighted Average Assumptions for Fair Values of Stock Options[Line Items]    
Restricted stock units awarded 400,000  
Possibility One | Performance-based restricted stock units [Member]    
Schedule of Weighted Average Assumptions for Fair Values of Stock Options[Line Items]    
Award vesting period 3 years  
Possibility One | Maximum | Performance-based restricted stock units [Member]    
Schedule of Weighted Average Assumptions for Fair Values of Stock Options[Line Items]    
Award vesting percentage 100.00%  
Possibility Two | Performance-based restricted stock units [Member]    
Schedule of Weighted Average Assumptions for Fair Values of Stock Options[Line Items]    
Award vesting period 5 years  
Award vesting percentage maximum 150.00%  
Plan 2011    
Schedule of Weighted Average Assumptions for Fair Values of Stock Options[Line Items]    
Eligibility period for employees to participate in ESPP 90 days  
Shares available for issuance under share based compensation plan 12,000,000  
Plan 2011 | Employee Stock Purchase Plan [Member]    
Schedule of Weighted Average Assumptions for Fair Values of Stock Options[Line Items]    
Percentage for fair market value fixed for pricing 85.00%  
Plan 2011 | Employee Stock Purchase Plan [Member] | Maximum    
Schedule of Weighted Average Assumptions for Fair Values of Stock Options[Line Items]    
Maximum percentage of an employees salary that can be used to purchase shares under the ESPP 10.00%