Cash, Cash Equivalents and Investments (Fair Value of Debt Securities by Contractual Maturity) (Details) - USD ($) $ in Thousands	Aug. 31, 2016	Nov. 30, 2015
Investments and Cash [Abstract]
Due in one year or less	$ 23,474	$ 15,945
Due after one year	21,126	12,955
Total	$ 44,600	$ 28,900