Other Comprehensive Income - Summary of Tax Effects on Each Component of OCI (Detail) - USD ($) $ in Thousands	3 Months Ended
Aug. 31, 2018	Aug. 31, 2017
Components Of Other Comprehensive Income Loss [Abstract]
Foreign currency translation, before tax	$ (3,695)	$ 15,872
Foreign currency translation, net of tax tax	(3,695)	15,872
Pension liability adjustment, tax	(97)	(6)
Pension liability adjustment, net of tax	(97)	(6)
Cash flow hedges, before tax	(2,527)	2,993
Cash flow hedges, tax	557	(1,106)
Cash flow hedges, net of tax	(1,970)	1,887
Other comprehensive income (loss), before tax	(6,222)	18,865
Other comprehensive income (loss), tax	460	(1,112)
Other comprehensive income (loss)	$ (5,762)	$ 17,753

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

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Amount before tax, after reclassification adjustments of gain (loss) on foreign currency translation adjustments, foreign currency transactions designated and effective as economic hedges of a net investment in a foreign entity and intra-entity foreign currency transactions that are of a long-term-investment nature.

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