Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Thousands	3 Months Ended
	Aug. 31, 2019	Aug. 31, 2018
Statement Of Income And Comprehensive Income [Abstract]
Net earnings (loss)	$ (2,455)	$ 56,958
Other comprehensive income (loss):
Foreign currency translation	4,782	(3,695)
Pension liability adjustment, net of tax	1,013	(97)
Cash flow hedges, net of tax	(2,639)	(1,970)
Other comprehensive income (loss)	3,156	(5,762)
Comprehensive income	701	51,196
Comprehensive income attributable to noncontrolling interests	2,321	1,999
Comprehensive income (loss) attributable to controlling interest	$ (1,620)	$ 49,197