Fair Value Measurements - Schedule of Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) - Fair Value, Measurements, Recurring - USD ($) $ in Thousands		May 31, 2018	May 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets		$ 11,423	$ 8,326
Liabilities		846	1,727
Derivative Contracts
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets	[1]	11,423	8,326
Liabilities	[1]	846	1,142
Contingent consideration obligations
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Liabilities	[2]		585
Significant Other Observable Inputs (Level 2)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets		11,423	8,326
Liabilities		846	1,142
Significant Other Observable Inputs (Level 2) | Derivative Contracts
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets	[1]	11,423	8,326
Liabilities	[1]	$ 846	1,142
Significant Unobservable Inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Liabilities			585
Significant Unobservable Inputs (Level 3) | Contingent consideration obligations
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Liabilities	[2]		$ 585

[1] The fair value of our derivative contracts was 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] (2)The fair value of the contingent consideration obligation was determined using a probability weighted cash flow approach based on management’s projections of future cash flows of the acquired business. The fair value measurements are based on significant inputs not observable in the market and thus represent Level 3 measurements.