Comprehensive Income (Loss) - Components of Changes in Accumulated Other Comprehensive Loss (Detail) - USD ($) $ in Thousands		3 Months Ended	12 Months Ended
		May 31, 2018	May 31, 2019	May 31, 2018	May 31, 2017
Accumulated Other Comprehensive Income Loss [Line Items]
Balance			$ 1,036,375	$ 1,073,929	$ 919,846
Other comprehensive income before reclassifications			(30,693)	28,753
Reclassification adjustments to income	[1]		(2,389)	(13,156)
Reclassification of stranded tax effects		$ 1,701		(1,701)
Income tax effect			4,198	(701)	542
Balance		1,036,375	948,394	1,036,375	1,073,929
Foreign Currency Translation
Accumulated Other Comprehensive Income Loss [Line Items]
Balance			(4,987)	(17,358)
Other comprehensive income before reclassifications			(14,652)	12,371
Balance		(4,987)	(19,639)	(4,987)	(17,358)
Pension Liability Adjustment
Accumulated Other Comprehensive Income Loss [Line Items]
Balance			(16,071)	(14,819)
Other comprehensive income before reclassifications			(3,404)	1,402
Reclassification adjustments to income	[1]		1,201	473
Reclassification of stranded tax effects				(2,818)
Income tax effect			418	(309)
Balance		(16,071)	(17,856)	(16,071)	(14,819)
Cash Flow Hedges
Accumulated Other Comprehensive Income Loss [Line Items]
Balance			6,478	4,402
Other comprehensive income before reclassifications			(12,637)	14,980
Reclassification adjustments to income	[1]		(3,590)	(13,629)
Reclassification of stranded tax effects				1,117
Income tax effect			3,780	(392)
Balance		6,478	(5,969)	6,478	4,402
Accumulated Other Comprehensive Loss, Net of Tax
Accumulated Other Comprehensive Income Loss [Line Items]
Balance			(14,580)	(27,775)	(28,565)
Reclassification of stranded tax effects				(1,701)
Balance		$ (14,580)	$ (43,464)	$ (14,580)	$ (27,775)

[1] The statement of earnings classification of amounts reclassified to income for cash flow hedges is disclosed in “Note Q – Derivative Instruments and Hedging Activities.”