Incentive Plans and Stock-Based Compensation (Details 3) (USD $) In Thousands, except Share data, unless otherwise specified	6 Months Ended
	May 31, 2014
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options Outstanding - Number (in shares)	2,606,135
Options Outstanding - Weighted Average Exercise Price (in dollars per share)	$ 44.43
Options Outstanding - Intrinsic Value	$ 38,079
Options Outstanding - Weighted Average Remaining Life in Years	6 years 8 months 13 days
Options Exercisable - Number (in shares)	1,654,715
Options Exercisable - Weighted Average Exercise Price (in dollars per share)	$ 39.21
Options Exercisable - Intrinsic Value	31,972
Options Exercisable - Weighted Average Remaining Life in Years	5 years 5 months 20 days
$25.31 - $28.79 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options Outstanding - Number (in shares)	149,900
Options Outstanding - Weighted Average Exercise Price (in dollars per share)	$ 26.92
Options Outstanding - Intrinsic Value	4,739
Options Outstanding - Weighted Average Remaining Life in Years	2 years
Options Exercisable - Number (in shares)	149,900
Options Exercisable - Weighted Average Exercise Price (in dollars per share)	$ 26.92
Options Exercisable - Intrinsic Value	4,739
Options Exercisable - Weighted Average Remaining Life in Years	2 years
$31.96 - $38.06 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options Outstanding - Number (in shares)	697,182
Options Outstanding - Weighted Average Exercise Price (in dollars per share)	$ 33.85
Options Outstanding - Intrinsic Value	17,209
Options Outstanding - Weighted Average Remaining Life in Years	4 years 11 days
Options Exercisable - Number (in shares)	696,932
Options Exercisable - Weighted Average Exercise Price (in dollars per share)	$ 33.85
Options Exercisable - Intrinsic Value	17,203
Options Exercisable - Weighted Average Remaining Life in Years	4 years 11 days
$40.73 - $57.74 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options Outstanding - Number (in shares)	1,318,103
Options Outstanding - Weighted Average Exercise Price (in dollars per share)	$ 46.29
Options Outstanding - Intrinsic Value	16,131
Options Outstanding - Weighted Average Remaining Life in Years	7 years 8 months 10 days
Options Exercisable - Number (in shares)	807,883
Options Exercisable - Weighted Average Exercise Price (in dollars per share)	$ 46.11
Options Exercisable - Intrinsic Value	10,030
Options Exercisable - Weighted Average Remaining Life in Years	7 years 4 months 11 days
$61.57 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options Outstanding - Number (in shares)	440,950
Options Outstanding - Weighted Average Exercise Price (in dollars per share)	$ 61.57
Options Outstanding - Intrinsic Value	0
Options Outstanding - Weighted Average Remaining Life in Years	9 years 6 months 15 days
Options Exercisable - Number (in shares)	0
Options Exercisable - Weighted Average Exercise Price (in dollars per share)	$ 0.00
Options Exercisable - Intrinsic Value	$ 0
Options Exercisable - Weighted Average Remaining Life in Years	0 years