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Stockholders' Equity - Additional Information (Detail) (USD $)
In Millions, except Share data, unless otherwise specified
12 Months Ended 3 Months Ended 12 Months Ended
Aug. 31, 2014
Aug. 31, 2014
Restricted Stock
Aug. 31, 2014
Time-based restricted stock units
Aug. 31, 2014
Performance-based restricted stock units
Aug. 31, 2014
Performance-based restricted stock units
Minimum
Aug. 31, 2014
Performance-based restricted stock units
Maximum
Aug. 31, 2014
Performance-based restricted stock units
Possibility One
Maximum
Aug. 31, 2014
Performance-based restricted stock units
Possibility Two
Maximum
May 31, 2014
After market services (AMS)
Aug. 31, 2014
Stock Option [Member]
Aug. 31, 2013
Stock Option [Member]
Aug. 31, 2012
Stock Option [Member]
Aug. 31, 2014
Employee Stock Purchase Plan
Feb. 28, 2011
Plan 2011
Feb. 28, 2011
Plan 2011
Employee Stock Purchase Plan
Stockholders Equity [Line Items]                              
Maximum aggregate number of shares subject to awards                           8,850,000 6,000,000
Total intrinsic value of options exercised                   $ 0.1 $ 1.2 $ 8.0      
Unrecognized compensation related to share-based compensation costs   34.9               0          
Total fair value of options vested                   0 0.1 1.3      
Award vesting period     3 years   3 years 5 years                  
Restricted stock units awarded     1,900,000 1,600,000                      
Award vesting percentage             100.00% 150.00%              
Performance goal full achievement   100.00%                          
Reversal to stock-based compensation expense 45.8 45.8                          
Awards vesting                 200,000            
Stock-based compensation expense                 $ 2.4            
Unrecognized compensation related to share-based compensation costs, weighted average period of recognition   1 year 4 months 24 days                          
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%    
Shares issued under ESPP 9,350,992                 1,077,071 902,691 754,598