Employee Benefit and Stock Plans (Details 1) (USD $)	12 Months Ended
	Nov. 30, 2011 Year
Range One [Member]
Stock options outstanding and stock options exercisable
Range of Exercise Price, Minimum	$ 6.32
Range of Exercise Price, Maximum	$ 10.54
Options Outstanding, Options	1,699,998
Options Outstanding, Weighted Average Exercise Price	$ 6.38
Options Outstanding, Weighted Average Remaining Contractual Life	9.8
Options Exercisable, Options	13,998
Options Exercisable, Weighted Average Exercise Price	$ 9.47
Options Exercisable, Weighted Average Remaining Contractual Life	0.0
Range Two [Member]
Stock options outstanding and stock options exercisable
Range of Exercise Price, Minimum	$ 10.55
Range of Exercise Price, Maximum	$ 14.96
Options Outstanding, Options	2,057,882
Options Outstanding, Weighted Average Exercise Price	$ 12.06
Options Outstanding, Weighted Average Remaining Contractual Life	7.6
Options Exercisable, Options	1,070,462
Options Exercisable, Weighted Average Exercise Price	$ 12.64
Options Exercisable, Weighted Average Remaining Contractual Life	0.0
Range Three [Member]
Stock options outstanding and stock options exercisable
Range of Exercise Price, Minimum	$ 14.97
Range of Exercise Price, Maximum	$ 20.08
Options Outstanding, Options	2,220,510
Options Outstanding, Weighted Average Exercise Price	$ 17.68
Options Outstanding, Weighted Average Remaining Contractual Life	7.3
Options Exercisable, Options	1,876,102
Options Exercisable, Weighted Average Exercise Price	$ 18.09
Options Exercisable, Weighted Average Remaining Contractual Life	0.0
Range Four [Member]
Stock options outstanding and stock options exercisable
Range of Exercise Price, Minimum	$ 20.09
Range of Exercise Price, Maximum	$ 33.92
Options Outstanding, Options	2,035,785
Options Outstanding, Weighted Average Exercise Price	$ 27.35
Options Outstanding, Weighted Average Remaining Contractual Life	6.1
Options Exercisable, Options	2,035,785
Options Exercisable, Weighted Average Exercise Price	$ 27.35
Options Exercisable, Weighted Average Remaining Contractual Life	0.0
Range Five [Member]
Stock options outstanding and stock options exercisable
Range of Exercise Price, Minimum	$ 33.93
Range of Exercise Price, Maximum	$ 69.63
Options Outstanding, Options	2,146,221
Options Outstanding, Weighted Average Exercise Price	$ 39.85
Options Outstanding, Weighted Average Remaining Contractual Life	6.4
Options Exercisable, Options	2,146,221
Options Exercisable, Weighted Average Exercise Price	$ 39.85
Options Exercisable, Weighted Average Remaining Contractual Life	0.0
Range Six [Member]
Stock options outstanding and stock options exercisable
Range of Exercise Price, Minimum	$ 6.32
Range of Exercise Price, Maximum	$ 69.63
Options Outstanding, Options	10,160,396
Options Outstanding, Weighted Average Exercise Price	$ 21.27
Options Outstanding, Weighted Average Remaining Contractual Life	7.3
Options Exercisable, Options	7,142,568
Options Exercisable, Weighted Average Exercise Price	$ 26.43
Options Exercisable, Weighted Average Remaining Contractual Life	6.5