Earnings (Loss) Per Share - Computation of Basic and Diluted Earnings (Loss) Per Share Attributable to Controlling Interest (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Aug. 31, 2019	Aug. 31, 2018
Numerator (basic & diluted):
Net earnings (loss)attributable to controlling interest - income (loss) available to common shareholders	$ (4,776)	$ 54,942
Denominator:
Denominator for basic earnings (loss) per share attributable to controlling interest- weighted average common shares	55,241	58,731
Effect of dilutive securities		1,890
Denominator for diluted earnings (loss) per share attributable to controlling interest-adjusted weighted average common shares	55,241	60,621
Basic earnings (loss) per share attributable to controlling interest	$ (0.09)	$ 0.94
Diluted earnings (loss) per share attributable to controlling interest	$ (0.09)	$ 0.91