Summary of Weighted-Average Grant-Date Fair Value of Options, Total Intrinsic Value of Options Exercised, and Cash Receipts from Options Exercised (Detail) - USD ($) $ / shares in Units, $ in Thousands |
12 Months Ended | ||
|---|---|---|---|
Aug. 31, 2015 |
Aug. 31, 2014 |
Aug. 31, 2013 |
|
| Disclosure of Compensation Related Costs, Share-based Payments [Abstract] | |||
| Weighted-average fair value of options granted (per share) | $ 8.35 | $ 14.46 | $ 10.49 |
| Intrinsic value gain of options exercised | $ 366 | $ 16,380 | $ 15,803 |
| Cash receipts from exercise of options | $ 1,147 | $ 21,995 | $ 24,840 |
| X | ||||||||||
- References No definition available.
|
| X | ||||||||||
- Definition The cash inflow associated with the amount received from holders exercising their stock options. This item inherently excludes any excess tax benefit, which the entity may have realized and reported separately. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|