Basis of Presentation - Fair Value of Foreign Exchange Forward Contracts (Detail) (Derivatives Not Designated as Hedging Instruments, Foreign exchange forward contracts, USD $) In Thousands, unless otherwise specified	Feb. 28, 2014	May 31, 2013
Other assets
Derivatives Not Designated as Hedging Instruments
Foreign exchange forward contracts Other assets	$ 0	$ 114
Accrued expenses
Derivatives Not Designated as Hedging Instruments
Foreign exchange forward contracts Accrued expenses	$ 25	$ 0