Intangible Assets and Goodwill (Summary Of Changes In The Carrying Amount Of Goodwill) (Details) - USD ($)	3 Months Ended	12 Months Ended
	Nov. 30, 2017	Nov. 30, 2017	Nov. 30, 2016	Nov. 30, 2015
Goodwill [Roll Forward]
Balance, beginning of year		$ 278,067,000	$ 369,985,000
Additions		36,934,000	0
Impairment		0	(92,000,000)	$ 0
Translation adjustments		40,000	82,000
Balance, end of year	$ 315,041,000	315,041,000	278,067,000	$ 369,985,000
OpenEdge [Member]
Goodwill [Roll Forward]
Balance, beginning of year		212,062,000
Additions		36,934,000
Translation adjustments		40,000
Balance, end of year	249,036,000	249,036,000	212,062,000
Data Connectivity and Integration [Member]
Goodwill [Roll Forward]
Balance, beginning of year		19,040,000
Additions		0
Translation adjustments		0
Balance, end of year	19,040,000	19,040,000	19,040,000
Application Development and Deployment [Member]
Goodwill [Roll Forward]
Balance, beginning of year		46,965,000
Additions		0
Impairment	(92,000,000)		(92,000,000)
Translation adjustments		0
Balance, end of year	$ 46,965,000	$ 46,965,000	$ 46,965,000