| Nine Months Ended October 31, | ||||||||
| 2008 | 2009 | |||||||
| Income before income taxes | $ | 21,417 | $ | 5,665 | ||||
| Fixed charges | 10,107 | 13,297 | ||||||
| Capitalized interest | (135 | ) | (59 | ) | ||||
| Total earnings | $ | 31,389 | $ | 18,903 | ||||
| Interest expense (including capitalized interest) | $ | 816 | $ | 2,868 | ||||
| Amortized premiums and expenses | 435 | 707 | ||||||
| Estimated interest within rent expense | 8,856 | 9,722 | ||||||
| Total fixed charges | $ | 10,107 | $ | 13,297 | ||||
| Ratio of earnings to fixed charges | 3.11 | 1.42 | ||||||
