Commitments And Contingencies (Narrative) (Details) (USD $) In Millions, unless otherwise specified	1 Months Ended	12 Months Ended
Jan. 21, 2010	Nov. 30, 2011	Nov. 30, 2010	Nov. 30, 2009
Commitments And Contingencies [Abstract]
Rent expense, net of sub-rental income		$ 12.4	$ 11.3	$ 12.4
Number of subsidiaries included in JuxtaComm complaint	2
Number of other defendants in JuxtaComm complaint	19

Rental expense for the reporting period incurred under operating leases, including minimum and any contingent rent expense, net of related sublease income.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 840

-SubTopic 20

-Section 50

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6453985&loc=d3e41499-112717

Name:	us-gaap_OperatingLeasesRentExpenseNet
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration