Costs and Estimated Earnings Related to Billings on Uncompleted Contracts - Additional Information (Detail) - USD ($)	12 Months Ended
Feb. 29, 2016	Feb. 28, 2015
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

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