Basis of Presentation - Fair Value of Foreign Exchange Forward Contracts (Detail) (Derivatives Not Designated as Hedging Instruments, Foreign exchange forward contracts, Other assets, USD $) In Thousands, unless otherwise specified	Aug. 31, 2014	May 31, 2014
Derivatives Not Designated as Hedging Instruments | Foreign exchange forward contracts | Other assets
Derivatives Not Designated as Hedging Instruments
Foreign exchange forward contracts Other assets	$ 125	$ 9