Goodwill And Other Acquired Intangible Assets (Schedule Of Acquired Intangible Assets) (Details)	12 Months Ended
	Nov. 30, 2011 years
Developed Technologies [Member]
Finite-Lived Intangible Assets [Line Items]
Estimated Life, Minimum	4
Estimated Life, Maximum	9
Weighted Average Remaining Period (years)	4.2
Customer Base [Member]
Finite-Lived Intangible Assets [Line Items]
Estimated Life, Minimum	3
Estimated Life, Maximum	9
Weighted Average Remaining Period (years)	3.7
Patents/Core Technologies [Member]
Finite-Lived Intangible Assets [Line Items]
Estimated Life, Minimum	3
Estimated Life, Maximum	8
Weighted Average Remaining Period (years)	3.4
Trademarks [Member]
Finite-Lived Intangible Assets [Line Items]
Estimated Life, Minimum	2
Estimated Life, Maximum	8
Weighted Average Remaining Period (years)	4.1
Maintenance Agreements [Member]
Finite-Lived Intangible Assets [Line Items]
Estimated Life, Minimum	4
Estimated Life, Maximum	9
Weighted Average Remaining Period (years)	3.8