Unusual Items - Unusual Items Expenses (Parenthetical) (Detail) (Estimated costs to divest [Member], USD $) In Millions, unless otherwise specified	3 Months Ended	6 Months Ended
May 31, 2013	May 31, 2013
Estimated costs to divest [Member]
Unusual or Infrequent Item [Line Items]
Benefit related to Company not being required to divest LDACS program	$ 4.0	$ 3.6

Amount of gain recognized in the income statement for an event or transaction, that is unusual in nature or occurs infrequently, but not both.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

-SubTopic 20

-Section 50

-Paragraph 3

-URI http://asc.fasb.org/extlink&oid=6365513&loc=d3e15138-107781

Name:	us-gaap_UnusualOrInfrequentItemGainGross
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration