Fair Value Measurements - Additional Information (Detail) - USD ($)	12 Months Ended
May. 31, 2015	May. 31, 2014
Fair Value Assets Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Transfer in and out of Level 1, Level 2 or Level 3 measurements	$ 0	$ 0
Transfer of Liability from Level 1 to Level 2	0	0
Transfer of Liability from Level 2 to Level 1	$ 0	$ 0

Fair Value Assets Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]

No definition available.

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- Definition

Amount of transfers of liabilities measured on a recurring basis out of Level 1 of the fair value hierarchy into Level 2.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (bb)

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

+ Details

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Period Type:	instant

- Definition

Amount of transfers of liabilities measured on a recurring basis out of Level 2 of the fair value hierarchy into Level 1.

+ References

+ Details

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- Definition

Amount of transfers of financial instrument classified as a liability into (out of) level 3 of the fair value hierarchy.

+ References

No definition available.

+ Details

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