Segment Information (Summary Of Revenue By Geographic Region) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Feb. 28, 2012	Feb. 28, 2011
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenues	$ 225,702	$ 185,341
United States [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenues	107,604	95,687
Other Americas [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenues	9,526	10,925
Total Americas [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenues	117,130	106,612
United Kingdom [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenues	24,404	16,343
Other EMEA [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenues	64,473	44,723
Total EMEA [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenues	88,877	61,066
APJ [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenues	$ 19,695	$ 17,663