Comprehensive Income (Loss) - Summary of Tax Effects on Each Component of Other Comprehensive Income (Loss) (Detail) - USD ($) $ in Thousands	12 Months Ended
May 31, 2019	May 31, 2018	May 31, 2017
Components Of Other Comprehensive Income Loss [Abstract]
Foreign currency translation, before tax	$ (14,772)	$ 12,744	$ 1,342
Foreign currency translation, net of tax tax	(14,772)	12,744	1,342
Pension liability adjustment, before tax	(2,203)	1,875	3,400
Pension liability adjustment, tax	418	(309)	(1,158)
Pension liability adjustment, net of tax	(1,785)	1,566	2,242
Cash flow hedges, before tax	(16,227)	1,351	(4,522)
Cash flow hedges, tax	3,780	(392)	1,700
Cash flow hedges, net of tax	(12,447)	959	(2,822)
Other comprehensive income (loss), before tax	(33,202)	15,970	220
Other comprehensive income (loss), tax	4,198	(701)	542
Other comprehensive income (loss)	$ (29,004)	$ 15,269	$ 762

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

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