Intangible Assets and Goodwill (Summary Of Changes In The Carrying Amount Of Goodwill) (Details) - USD ($)	3 Months Ended	12 Months Ended
	Nov. 30, 2016	Nov. 30, 2016	Nov. 30, 2015	Nov. 30, 2014
Goodwill [Roll Forward]
Balance, beginning of year		$ 369,985,000	$ 232,836,000
Additions		0	137,472,000
Impairment		(92,000,000)	0	$ 0
Translation adjustments		82,000	(323,000)
Balance, end of year	$ 278,067,000	278,067,000	369,985,000	$ 232,836,000
OpenEdge [Member]
Goodwill [Roll Forward]
Balance, beginning of year		211,980,000
Impairment		0
Translation adjustments		82,000
Balance, end of year	212,062,000	212,062,000	211,980,000
Data Connectivity and Integration [Member]
Goodwill [Roll Forward]
Balance, beginning of year		19,040,000
Impairment		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		138,965,000
Impairment	(92,000,000)	(92,000,000)
Translation adjustments		0
Balance, end of year	$ 46,965,000	$ 46,965,000	$ 138,965,000