Fair Value - Schedule of Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) - Fair Value, Measurements, Recurring - USD ($) $ in Thousands		Feb. 29, 2020	May 31, 2019
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets		$ 881	$ 2,414
Liabilities		7,673	12,238
Derivative Instruments
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets	[1]	881	2,414
Liabilities	[1]	7,673	12,238
Significant Other Observable Inputs (Level 2)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets		881	2,414
Liabilities		7,673	12,238
Significant Other Observable Inputs (Level 2) | Derivative Instruments
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets	[1]	881	2,414
Liabilities	[1]	$ 7,673	$ 12,238

[1] The fair value of our derivative instruments 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 Q – Derivative Instruments and Hedging Activities” for additional information regarding our use of derivative instruments.