Comprehensive Income (Loss) - Summary of Tax Effects on Each Component of Other Comprehensive Income (Loss) (Detail) - USD ($) $ in Thousands	12 Months Ended
May 31, 2018	May 31, 2017	May 31, 2016
Components Of Other Comprehensive Income Loss [Abstract]
Foreign currency translation, before tax	$ 12,744	$ 1,342	$ 4,716
Foreign currency translation, net of tax tax	12,744	1,342	4,716
Pension liability adjustment, before tax	1,875	3,400	(3,233)
Pension liability adjustment, tax	(309)	(1,158)	1,175
Pension liability adjustment, net of tax	1,566	2,242	(2,058)
Cash flow hedges, before tax	1,351	(4,522)	35,524
Cash flow hedges, tax	(392)	1,700	(13,316)
Cash flow hedges, net of tax	959	(2,822)	22,208
Other comprehensive income (loss), before tax	15,970	220	37,007
Other comprehensive income (loss), tax	(701)	542	(12,141)
Other comprehensive income	$ 15,269	$ 762	$ 24,866

Amount before tax, after reclassification adjustments of other comprehensive income (loss).

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