Cash, Cash Equivalents and Investments (Fair Value of Debt Securities by Contractual Maturity) (Details) - USD ($) $ in Thousands	May 31, 2016	Nov. 30, 2015
Investments and Cash [Abstract]
Due in one year or less	$ 27,380	$ 15,945
Due after one year	21,996	12,955
Total	$ 49,376	$ 28,900