|
Employee Benefit Plans (Schedule Of Stock Options Activity) (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
|
12 Months Ended |
|
Jan. 31, 2012
years
|
| Employee Benefit Plans [Abstract] |
|
| Shares, Outstanding at January 31, 2011 |
2,881,356 |
| Shares, Granted |
12,882 |
| Shares, Exercised |
(1,215,028) |
| Shares, Canceled |
(27,810) |
| Shares, Outstanding at January 31, 2012 |
1,651,400 |
| Vested and expected to vest at January 31, 2012, Shares |
1,638,799 |
| Exercisable at January 31, 2012, Shares |
1,296,587 |
| Weighted-average exercise price, Outstanding at January 31, 2011 |
$ 35.36 |
| Weighted-average exercise price, Granted |
$ 48.79 |
| Weighted-average exercise price, Exercised |
$ 37.76 |
| Weighted-average exercise price, Canceled |
$ 23.95 |
| Weighted-average exercise price, Outstanding at January 31, 2012 |
$ 33.89 |
| Weighted-average exercise price, Vested and expected to vest at January 31, 2012 |
$ 33.95 |
| Weighted-average exercise price, Exercisable at January 31, 2012 |
$ 36.72 |
| Weighted-Average remaining contractual term (in years), Outstanding at January 31, 2012 |
4.2 |
| Weighted-Average remaining contractual term (in years), Vested and expected to vest at January 31, 2012 |
4.1 |
| Weighted-Average remaining contractual term (in years), Exercisable at January 31, 2012 |
3.3 |
| Aggregate intrinsic value, Outstanding |
$ 29,783 |
| Aggregate intrinsic value, Vested and expected to vest at January 31, 2012 |
29,444 |
| Aggregate intrinsic value, Exercisable at January 31, 2012 |
$ 19,712 |