Business Segments and International Operations (Narrative) (Details) $ in Thousands	12 Months Ended
	Nov. 30, 2017 USD ($) segment	Nov. 30, 2016 USD ($)	Nov. 30, 2015 USD ($)
Segment Reporting [Abstract]
Number of reportable segments | segment	3
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived assets	$ 42,261	$ 50,105
United States [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived assets	39,500	45,400	$ 50,300
Outside United States [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived assets	$ 2,800	$ 4,700	$ 3,900