Financial Assets and Liabilities Measured on a Recurring Basis (Parenthetical) (Detail) - Recurring Basis	Feb. 28, 2017	Feb. 29, 2016
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Margin balance, interest rate	2.00%	2.00%
Level 1 Assets and Liabilities
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Margin balance, interest rate	2.00%	2.00%

Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

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 210.5-02.22(a)(1))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28551-108399

Name:	us-gaap_DebtInstrumentInterestRateEffectivePercentage
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant