Cash, Cash Equivalents and Investments (Fair Value of Debt Securities by Contractual Maturity) (Details) (USD $) In Thousands, unless otherwise specified	Aug. 31, 2014		Nov. 30, 2013
Investments and Cash [Abstract]
Due in one year or less	$ 11,664	[1]	$ 42,198	[1]
Due after one year	7,248	[2]	15,185	[2]
Total	$ 18,912		$ 57,383

[1] nclude ARS which are tendered for interest-rate setting purposes periodically throughout the year.

[2] Includes state and municipal bond obligations, which are securities representing investments available for current operations and are classified as current in the consolidated balance sheets.