Costs and Estimated Earnings Related to Billings on Uncompleted Contracts - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended	12 Months Ended
Nov. 30, 2013	Feb. 28, 2013
Uncompleted Contracts [Line Items]
Production costs that exceeded the aggregate estimated cost	$ 0	$ 0
Outstanding claims relating to contract values	0	0
Progress payments that had been netted against inventory	$ 0	$ 0

Amount of advances received from customers under long-term contracts which have been offset against inventories accounts at the balance sheet date.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.6(d)(iii))

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 6

-Subparagraph d(3)

-Article 5

Name:	us-gaap_ProgressPaymentsNettedAgainstInventoryForLongTermContractsOrPrograms
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant