INVESTMENTS - Summary of Marketable Securities which are Classified as Available-for-Sale (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended	12 Months Ended
	Feb. 28, 2014	Nov. 30, 2013
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 270,598	$ 330,143
Gross Unrealized Gains	359	188
Gross Unrealized Losses	0	0
Aggregate Fair Value	270,957	330,331
Money market funds
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	35,297	245,953
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Aggregate Fair Value	35,297	245,953
Corporate bonds and commercial paper
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	210,457	77,442
Gross Unrealized Gains	240	66
Gross Unrealized Losses	0	0
Aggregate Fair Value	210,697	77,508
U.S. Government debt and agency securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	24,114	6,012
Gross Unrealized Gains	6	1
Gross Unrealized Losses	0	0
Aggregate Fair Value	24,120	6,013
Term deposits
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	529	536
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Aggregate Fair Value	529	536
Mortgage-backed securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	201	200
Gross Unrealized Gains	113	121
Gross Unrealized Losses	0	0
Aggregate Fair Value	$ 314	$ 321