INVESTMENTS - Summary of Contractual Maturities of Fixed Income Securities Included in Short-Term Investments (Details) (USD $) In Thousands, unless otherwise specified	Feb. 28, 2014	Nov. 30, 2013
Schedule of Available-for-sale Securities [Line Items]
Short-term investments	$ 235,131	$ 83,842
Short-term Investments
Schedule of Available-for-sale Securities [Line Items]
Contractual maturities, less than one year	97,991	36,084
Contractual maturities, one to three years	137,140	47,758
Short-term investments	$ 235,131	$ 83,842