Stock Option Activity (Detail) (USD $)
In Thousands, except Share data, unless otherwise specified | 12 Months Ended |
|---|
Aug. 31, 2011
Year
Entity | Aug. 31, 2010
Year | Aug. 31, 2009
Year |
|---|
| Number of Options | | | |
| Options outstanding as of August 31, 2010 | 20,920,062 | | |
| Granted | 8,273 | | |
| Exercised | (12,679,146) | | |
| Forfeited | (153,726) | | |
| Options outstanding as of August 31, 2011 | 8,095,463 | 20,920,062 | |
| Options exercisable as of August 31 | 7,902,845 | 20,386,549 | 28,150,454 |
| Weighted Average Exercise Price | | | |
| Options outstanding as of August 31, 2010 | $ 19.63 | | |
| Granted | $ 48.11 | | |
| Exercised | $ 16.90 | | |
| Forfeited | $ 19.08 | | |
| Options outstanding as of August 31, 2011 | $ 23.96 | $ 19.63 | |
| Options exercisable as of August 31 | $ 23.79 | $ 19.42 | $ 19.11 |
| Aggregate Intrinsic Value | | | |
| Options outstanding as of August 31, 2010 | $ 356,341 | | |
| Options outstanding as of August 31, 2011 | 242,116 | 356,341 | |
| Options exercisable as of August 31 | $ 237,690 | $ 351,374 | $ 406,360 |
| Weighted Average Remaining Contractual Term (In Years) | | | |
| Options outstanding as of August 31, 2010 | 2.6 | | |
| Options outstanding as of August 31, 2011 | 3.1 | 2.6 | |
| Options exercisable as of August 31 | 3.0 | 2.5 | 3.4 |