Inventories - Additional Information (Detail) - USD ($) $ in Thousands	12 Months Ended
Feb. 29, 2016	Feb. 28, 2015	Feb. 28, 2014
Inventory Disclosure [Abstract]
Excess of current costs at FIFO over LIFO stated values	$ 4,700	$ 4,900
Decrease in cost of sales	205	87	$ 25
Net earnings	$ 129	$ 55	$ 16

The excess of replacement or current cost over the stated LIFO (last in first out) inventory value when the LIFO inventory method is utilized.

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

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