Intangible Assets And Goodwill (Narrative) (Details) (USD $)	12 Months Ended
Nov. 30, 2012 Y	Nov. 30, 2011	Nov. 30, 2010	Nov. 30, 2012 Purchased Technology [Member] Y	Nov. 30, 2012 Customer-Related And Other [Member] Y	Aug. 31, 2012 Core segment [Member]	Aug. 31, 2012 Non-Core segment [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible assets, weighted average amortization period (in years)	6.5			6.4	6.6
Intangible assets, amortization expense	$ 2,200,000	$ 3,600,000	$ 8,600,000
Goodwill	226,110,000	256,211,000	236,730,000			225,900,000	30,000,000
Goodwill impairment loss	$ 0	$ 0	$ 0

Carrying amount as of the balance sheet date, which is the cumulative amount paid and (if applicable) the fair value of any noncontrolling interest in the acquiree, adjusted for any amortization recognized prior to the adoption of any changes in generally accepted accounting principles (as applicable) and for any impairment charges, in excess of the fair value of net assets acquired in one or more business combination transactions.

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+ Details

- Definition

Loss recognized during the period that results from the write-down of goodwill after comparing the implied fair value of reporting unit goodwill with the carrying amount of that goodwill. Goodwill is assessed at least annually for impairment.

+ References

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+ Details