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Investments - Summary of Investments (Detail) (USD $) In Thousands, unless otherwise specified	May 31, 2014	May 31, 2013
Schedule of Held-to-maturity Securities [Line Items]
Gross Amortized Costs	$ 0	$ 4,000
U. S. Treasury Bills [Member]
Schedule of Held-to-maturity Securities [Line Items]
Gross Amortized Costs	0	4,000
Gross Unrealized Gains	0	0
Fair Value	$ 0	$ 4,000

X

- Definition

Amount of accumulated unrealized gain on investments in debt securities classified as held-to-maturity.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 50

-Paragraph 5

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27232-111563

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X

- Definition

Amount after other than temporary impairment (OTTI) accretion, of investments in debt securities classified as held-to-maturity, expected to be converted to cash, sold or exchanged within one year or the normal operating cycle.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 45

-Paragraph 2

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Fair value of investments in debt securities classified as held-to-maturity.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 50

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-Name Accounting Standards Codification

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