| September 30, | ||||||
| 2013 | 2012 | 2011 | ||||
| Weighted average common shares outstanding — basic | 231,067 | 252,906 | 272,471 | |||
| Effect of dilutive securities — stock options, restricted stock, | ||||||
| and restricted stock units | 4,278 | 3,997 | 5,246 | |||
| Weighted average common shares outstanding — diluted | 235,345 | 256,903 | 277,717 | |||