INVESTMENTS - Summary of Marketable Securities which are Classified as Available-for-Sale (Details) (USD $) In Thousands, unless otherwise specified	9 Months Ended	12 Months Ended
	Aug. 31, 2014	Nov. 30, 2013
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 191,637	$ 330,143
Gross Unrealized Gains	678	188
Gross Unrealized Losses	(35)	0
Aggregate Fair Value	192,280	330,331
Money market funds
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	14,192	245,953
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Aggregate Fair Value	14,192	245,953
Corporate bonds and commercial paper
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	156,919	77,442
Gross Unrealized Gains	434	66
Gross Unrealized Losses	(9)	0
Aggregate Fair Value	157,344	77,508
U.S. Government debt and agency securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	20,324	6,012
Gross Unrealized Gains	8	1
Gross Unrealized Losses	0	0
Aggregate Fair Value	20,332	6,013
Term deposits
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost		536
Gross Unrealized Gains		0
Gross Unrealized Losses		0
Aggregate Fair Value		536
Mortgage-backed securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	202	200
Gross Unrealized Gains	236	121
Gross Unrealized Losses	(26)	0
Aggregate Fair Value	$ 412	$ 321