Schedule of Financial Assets And Liabilities Measured at Fair Value on Recurring Basis (Detail) (USD $) In Thousands, unless otherwise specified	Feb. 28, 2015		May 31, 2014
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets	$ 511		$ 1,284
Liabilities	28,857		4,879
Derivative Contracts
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets	511	[1]	1,284	[1]
Liabilities	24,878	[1]	4,475	[1]
Contingent consideration obligation
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Liabilities	3,979	[2]	404	[2]
Significant Other Observable Inputs (Level 2)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets	511		1,284
Liabilities	24,878		4,475
Significant Other Observable Inputs (Level 2) | Derivative Contracts
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets	511	[1]	1,284	[1]
Liabilities	24,878	[1]	4,475	[1]
Significant Unobservable Inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Liabilities	3,979		404
Significant Unobservable Inputs (Level 3) | Contingent consideration obligation
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Liabilities	$ 3,979	[2]	$ 404	[2]

[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 P - Derivative Instruments and Hedging Activities" for additional information regarding our use of derivative instruments.

[2] The fair value of the Company's contingent consideration obligations is determined using a probability weighted cash flow approach based on management's projections of future cash flows of the acquired businesses. The fair value measurements are based on significant inputs not observable in the market and thus represent Level 3 measurements.