Share-Based Compensation (Outstanding Stock Options) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	6 Months Ended
	Aug. 31, 2012	Feb. 29, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options Outstanding, Number of Shares	13,987
Options Outstanding, Weighted Average Remaining Contractual Life (Years)	3 years 9 months 18 days
Options Outstanding, Weighted Average Exercise Price	$ 21.93	$ 19.84
Options Exercisable, Number of Shares	9,221
Options Exercisable, Weighted Average Exercise Price	$ 18.61
$7.14 To $10.75 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options Outstanding, Number of Shares	482
Options Outstanding, Weighted Average Remaining Contractual Life (Years)	7 months 6 days
Options Outstanding, Weighted Average Exercise Price	$ 7.15
Options Exercisable, Number of Shares	482
Options Exercisable, Weighted Average Exercise Price	$ 7.15
Range of Exercise Prices, lower range	$ 7.14
Range of Exercise Prices, upper range	$ 10.75
$11.43 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options Outstanding, Number of Shares	2,196
Options Outstanding, Weighted Average Remaining Contractual Life (Years)	3 years 7 months 6 days
Options Outstanding, Weighted Average Exercise Price	$ 11.43
Options Exercisable, Number of Shares	1,618
Options Exercisable, Weighted Average Exercise Price	$ 11.43
Range of Exercise Prices, lower range	$ 11.43
$13.19 To $14.81
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options Outstanding, Number of Shares	2,044
Options Outstanding, Weighted Average Remaining Contractual Life (Years)	2 years 3 months 18 days
Options Outstanding, Weighted Average Exercise Price	$ 13.83
Options Exercisable, Number of Shares	2,044
Options Exercisable, Weighted Average Exercise Price	$ 13.83
Range of Exercise Prices, lower range	$ 13.19
Range of Exercise Prices, upper range	$ 14.81
$14.86 To $19.82 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options Outstanding, Number of Shares	2,033
Options Outstanding, Weighted Average Remaining Contractual Life (Years)	2 years 4 months 24 days
Options Outstanding, Weighted Average Exercise Price	$ 19.22
Options Exercisable, Number of Shares	2,033
Options Exercisable, Weighted Average Exercise Price	$ 19.22
Range of Exercise Prices, lower range	$ 14.86
Range of Exercise Prices, upper range	$ 19.82
$19.98 To $25.12 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options Outstanding, Number of Shares	1,304
Options Outstanding, Weighted Average Remaining Contractual Life (Years)	1 year 10 months 24 days
Options Outstanding, Weighted Average Exercise Price	$ 24.78
Options Exercisable, Number of Shares	1,233
Options Exercisable, Weighted Average Exercise Price	$ 24.84
Range of Exercise Prices, lower range	$ 19.98
Range of Exercise Prices, upper range	$ 25.12
$25.39 To $30.24 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options Outstanding, Number of Shares	1,851
Options Outstanding, Weighted Average Remaining Contractual Life (Years)	4 years 6 months
Options Outstanding, Weighted Average Exercise Price	$ 25.56
Options Exercisable, Number of Shares	1,019
Options Exercisable, Weighted Average Exercise Price	$ 25.41
Range of Exercise Prices, lower range	$ 25.39
Range of Exercise Prices, upper range	$ 30.24
$31.76 To $32.05 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options Outstanding, Number of Shares	2,189
Options Outstanding, Weighted Average Remaining Contractual Life (Years)	6 years 7 months 6 days
Options Outstanding, Weighted Average Exercise Price	$ 31.76
Options Exercisable, Number of Shares	140
Options Exercisable, Weighted Average Exercise Price	$ 31.77
Range of Exercise Prices, lower range	$ 31.76
Range of Exercise Prices, upper range	$ 32.05
$32.69 To $33.11 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options Outstanding, Number of Shares	1,888
Options Outstanding, Weighted Average Remaining Contractual Life (Years)	5 years 7 months 6 days
Options Outstanding, Weighted Average Exercise Price	$ 32.70
Options Exercisable, Number of Shares	652
Options Exercisable, Weighted Average Exercise Price	$ 32.70
Range of Exercise Prices, lower range	$ 32.69
Range of Exercise Prices, upper range	$ 33.11