Deferred Costs - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
Feb. 29, 2016	Feb. 29, 2016	Feb. 28, 2015
Deferred Costs [Abstract]
Allowance for deferred costs related to supply agreements	$ 3,571	$ 3,571	$ 2,300
Impairment charge	$ 8,510	7,657	$ 4,422
Impairment charges recovered		$ 853

The charge against earnings resulting from the write down of long lived assets other than goodwill due to the difference between the carrying value and lower fair value.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=51719941&loc=d3e2921-110230

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3602-108585

Name:	us-gaap_OtherAssetImpairmentCharges
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration