Financial Assets and Liabilities Measured on a Recurring Basis (Detail) - Recurring Basis $ in Thousands	Feb. 28, 2018 USD ($)
Current trading investments
Total value of investments	$ 286
Current liabilities:
Margin balance	(106)
Total value of liabilities	(106)
Total	180
Stocks, options, and ETF (long)
Current trading investments
Current trading investments	291
Stocks, options, and ETF (short)
Current trading investments
Current trading investments	(5)
Level 1 Assets and Liabilities
Current trading investments
Total value of investments	286
Current liabilities:
Margin balance	(106)
Total value of liabilities	(106)
Total	180
Level 1 Assets and Liabilities \| Stocks, options, and ETF (long)
Current trading investments
Current trading investments	291
Level 1 Assets and Liabilities \| Stocks, options, and ETF (short)
Current trading investments
Current trading investments	$ (5)

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

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-Publisher FASB
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-Topic 820
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-Section 50
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Fair value of asset after deduction of liability.

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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/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258

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

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 825
-Section 25
-Paragraph 2
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