Annual report pursuant to Section 13 and 15(d)

Summary of Stock Option Activity (Detail)

v3.3.0.814
Summary of Stock Option Activity (Detail)
$ / shares in Units, $ in Millions
 12 Months Ended
Aug. 31, 2015
USD ($)
$ / shares
shares
Number of Stock Option Outstanding  
Beginning Balance | shares 3,250,401
Granted | shares 777,238
Exercised | shares (70,581)
Forfeited | shares (104,395)
Ending Balance | shares 3,852,663
Options exercisable at end of Period | shares 2,551,341
Weighted Average Exercise Price  
Beginning Balance $ 25.24
Granted 21.41
Exercised 19.99
Forfeited 28.50
Ending Balance 24.47
Options exercisable at end of Period $ 24.29
Option Outstanding weighted average remaining term 4 years 11 months
Option exercisable weighted average remaining term 3 years
Stock option, aggregate intrinsic Value | $ $ 2.9
Stock option, aggregate intrinsic Value | $ $ 2.3