Schedule of Financial Assets And Liabilities Measured at Fair Value on Recurring Basis (Detail) - USD ($) $ in Thousands		Aug. 31, 2015	May. 31, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets		$ 11	$ 171
Liabilities		26,091	26,110
Derivative Contracts
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets	[1]	11	171
Liabilities	[1]	22,112	22,131
Contingent consideration obligation
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Liabilities	[2]	3,979	3,979
Significant Other Observable Inputs (Level 2)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets		11	171
Liabilities		22,112	22,131
Significant Other Observable Inputs (Level 2) | Derivative Contracts
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets	[1]	11	171
Liabilities	[1]	22,112	22,131
Significant Unobservable Inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Liabilities		3,979	3,979
Significant Unobservable Inputs (Level 3) | Contingent consideration obligation
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Liabilities	[2]	$ 3,979	$ 3,979

[1] The fair value of our derivative contracts is based on the present value of the expected future cash flows considering the risks involved, including non-performance risk, and using discount rates appropriate for the respective maturities. Market observable, Level 2 inputs are used to determine the present value of the expected future cash flows. Refer to "Note N - Derivative Instruments and Hedging Activities" for additional information regarding our use of derivative instruments.

[2] The fair value of the contingent consideration obligation is determined using a probability weighted cash flow approach based on management's projections of future cash flows of the acquired business. The fair value measurement was based on Level 3 inputs not observable in the market.