The aggregate value (measured at the lower of net carrying value or fair value less cost of disposal) for current assets (assets with expected useful life shorter than one year or one operating cycle, whichever is longer) of a disposal group, including a component of the entity (discontinued operation), to be sold or that has subsequently been disposed of through sale, as of the financial statement date.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 205

-SubTopic 20

-Section 45

-Paragraph 10

-URI http://asc.fasb.org/extlink&oid=6892542&loc=d3e1107-107759

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 144

-Paragraph 46

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Name:	us-gaap_AssetsOfDisposalGroupIncludingDiscontinuedOperationCurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

Fair Value Measurements (Nonrecurring Measurements) (Details) (USD $)							12 Months Ended
	Feb. 28, 2013	Nov. 30, 2012	Nov. 30, 2012 Fair Value, Measurements, Nonrecurring [Member]	Nov. 30, 2012 Fair Value, Measurements, Nonrecurring [Member] Level 1 [Member]	Nov. 30, 2012 Fair Value, Measurements, Nonrecurring [Member] Level 2 [Member]	Nov. 30, 2012 Fair Value, Measurements, Nonrecurring [Member] Level 3 [Member]	Nov. 30, 2012 Artix, Orbacus and Orbix [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets held for sale	$ 0	$ 68,029,000	$ 16,487,000	$ 0	$ 16,487,000	$ 0
Impairment loss on assets held for sale							8,601,000
Assets held for sale, at fair value							16,487,000
Assets held for sale, at carrying value							$ 25,100,000