|
Net Income Per Share - Additional Information (Detail)
In Millions, unless otherwise specified |
12 Months Ended | ||
|---|---|---|---|
|
Jan. 31, 2014
|
Jan. 31, 2013
|
Jan. 31, 2012
|
|
| Earnings Per Share [Abstract] | |||
| Potentially dilutive shares excluded from the computation of diluted net income per share | 5.4 | 9.6 | 12.9 |