Segment Information (Revenue from External Customers from Different Geographical Areas) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Aug. 31, 2012	Aug. 31, 2011	Aug. 31, 2012	Aug. 31, 2011
Revenue from External Customer [Line Items]
Total revenue	$ 107,173	$ 124,511	$ 337,158	$ 386,371
North America [Member]
Revenue from External Customer [Line Items]
Total revenue	54,032	56,445	161,613	175,496
EMEA [Member]
Revenue from External Customer [Line Items]
Total revenue	37,472	47,376	123,120	150,515
Latin America [Member]
Revenue from External Customer [Line Items]
Total revenue	8,167	10,411	25,781	28,984
Asia Pacific [Member]
Revenue from External Customer [Line Items]
Total revenue	$ 7,502	$ 10,279	$ 26,644	$ 31,376