CONVERTIBLE SENIOR NOTES (Details) (USD $) Share data in Millions, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended			1 Months Ended	3 Months Ended	6 Months Ended	9 Months Ended
	Aug. 31, 2013	Aug. 31, 2012	Aug. 31, 2013	Aug. 31, 2012	Nov. 30, 2012	Apr. 30, 2012 Convertible Debt	Aug. 31, 2013 Convertible Debt	May 31, 2013 Convertible Debt	Aug. 31, 2013 Convertible Debt	Aug. 31, 2012 Convertible Debt	Aug. 31, 2013 Fair Value, Inputs, Level 2
Debt Disclosure [Line Items]
Principal amount of senior note						$ 600,000,000				$ 600,000,000
Debt instrument, fixed annual interest rate						2.25%
Principal amount of note						1,000	1,000		1,000
Convertible senior notes conversion ratio (shares)						19.7750
Convertible senior notes initial conversion price (in dollars per share)						$ 50.57
Convertible senior notes minimum number of days out of thirty consecutive trading days that common stock price exceeded conversion price									20 days
Convertible senior notes number of consecutive trading days									30 days
Convertible senior notes minimum percentage of conversion price							130.00%		130.00%
Consecutive trading day period									5 days
Convertible senior notes maximum percentage of trading price							98.00%		98.00%
Stock observation period									35 days
Payments classification for shares repurchased			105,289,000	220,265,000		121,000,000
Shares repurchased (in shares)			5.0			3.6
Debt effective interest rate						5.50%
Debt discount, before tax						84,600,000	63,900,000		63,900,000
Debt discount, after tax						52,600,000
Convertible senior notes, net	536,062,000		536,062,000		524,466,000		536,100,000		536,100,000
Deferred issuance costs						15,600,000
Deferred issuance costs, liability component						13,400,000
Deferred issuance costs, equity component						2,200,000
Deferred issuance costs, equity component net of tax						1,400,000
Interest expense	8,411,000	8,713,000	25,856,000	14,573,000			8,000,000
Loan origination fees and issuance costs							3,400,000	3,400,000
Amortization of debt discount							3,900,000
Amortization of debt issuance costs							700,000
Convertible senior notes, fair value disclosures											$ 606,800,000