Financial Assets and Liabilities Measured on a Recurring Basis (Detail) (Recurring Basis, USD $) In Thousands, unless otherwise specified	Feb. 28, 2015	Feb. 28, 2014
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Total value of investments	$ 6,524us-gaap_AssetsFairValueDisclosure	$ 4,913us-gaap_AssetsFairValueDisclosure
Current Liabilities:
Margin balance	(4,008)
Total value of liabilities	(4,008)
Total	2,516us-gaap_FairValueNetAssetLiability	4,914us-gaap_FairValueNetAssetLiability
Current trading investments
Other		123us-gaap_OtherAssetsFairValueDisclosure
Stocks, options, and ETF (long)
Current trading investments
Current trading investments	6,308	4,764
Stocks, options, and ETF (short)
Current trading investments
Current trading investments	(10)	(112)
Mutual Funds
Current trading investments
Current trading investments	226	139
Level 1 Assets and Liabilities
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Total value of investments	6,524	4,913
Current Liabilities:
Margin balance	(4,008)
Total value of liabilities	(4,008)
Total	2,516	4,914
Current trading investments
Other		123
Level 1 Assets and Liabilities \| Stocks, options, and ETF (long)
Current trading investments
Current trading investments	6,308	4,764
Level 1 Assets and Liabilities \| Stocks, options, and ETF (short)
Current trading investments
Current trading investments	(10)	(112)
Level 1 Assets and Liabilities \| Mutual Funds
Current trading investments
Current trading investments	$ 226	$ 139

Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258

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Fair value of asset after deduction of liability.

+ References

No definition available.

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Fair value of financial obligations, including, but not limited to, debt instruments, derivative liabilities, federal funds purchased and sold under agreements to repurchase, securities loaned or sold under agreements to repurchase, financial instruments sold not yet purchased, guarantees, line of credit, loans and notes payable, servicing liability, and trading liabilities.

+ References

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- Definition

Fair value portion of investment securities, including, but not limited to, marketable securities, derivative financial instruments, and investments accounted for under the equity method.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Available-for-Sale Securities

-URI http://asc.fasb.org/extlink&oid=6505594

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

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Trading Securities

-URI http://asc.fasb.org/extlink&oid=6526789

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 25

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=28360136&loc=d3e22054-111558

Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 1

-Subparagraph a, f, g

-Article 7

Reference 5: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 35

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=27723805&loc=d3e24584-111560

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- Definition

Fair value portion of liability related to investment contracts for example, but not limited to, guaranteed investment contract or annuities.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 944

-SubTopic 825

-Section 25

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6487514&loc=d3e32427-158581

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 14

-Article 7

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- Definition

Fair value portion of other assets.

+ References

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