Other Comprehensive Income - Summary of Tax Effects on Each Component of OCI (Detail) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
Feb. 28, 2019	Nov. 30, 2018	Aug. 31, 2018	Feb. 28, 2018	Nov. 30, 2017	Aug. 31, 2017	Feb. 28, 2019	Feb. 28, 2018
Components Of Other Comprehensive Income Loss [Abstract]
Foreign currency translation, before tax	$ 1,476			$ 9,542			$ (8,857)	$ 26,925
Foreign currency translation, net of tax	1,476			9,542			(8,857)	26,925
Pension liability adjustment, before tax	48			230			48	230
Pension liability adjustment, tax	(11)			21			(108)	15
Pension liability adjustment, net of tax	37			251			(60)	245
Cash flow hedges, before tax	(844)			(711)			(9,437)	(1,213)
Cash flow hedges, tax	248			155			2,209	334
Cash flow hedges, net of tax	(596)			(556)			(7,228)	(879)
Other comprehensive income (loss), before tax	680			9,061			(18,246)	25,942
Other comprehensive income (loss), tax	237			176			2,101	349
Other comprehensive income (loss)	$ 917	$ (11,300)	$ (5,762)	$ 9,237	$ (699)	$ 17,753	$ (16,145)	$ 26,291

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

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