Earnings Per Share - Computation of Basic and Diluted Earnings Per Share Attributable to Controlling Interest (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Feb. 29, 2020	Feb. 28, 2019	Feb. 29, 2020	Feb. 28, 2019
Numerator (basic & diluted):
Net earnings attributable to controlling interest - income available to common shareholders	$ 15,311	$ 26,773	$ 62,621	$ 115,717
Denominator:
Denominator for basic earnings per share attributable to controlling interest - weighted average common shares	54,930	56,478	55,078	57,650
Effect of dilutive securities	968	1,496	1,086	1,739
Denominator for diluted earnings per share attributable to controlling interest - adjusted weighted average common shares	55,898	57,974	56,164	59,389
Basic earnings per share attributable to controlling interest	$ 0.28	$ 0.47	$ 1.14	$ 2.01
Diluted earnings per share attributable to controlling interest	$ 0.27	$ 0.46	$ 1.11	$ 1.95