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		6 Months Ended
	Nov. 30, 2018	Nov. 30, 2017	Nov. 30, 2018	Nov. 30, 2017
Numerator (basic & diluted):
Net earnings attributable to controlling interest - income available to common shareholders	$ 34,002	$ 39,403	$ 88,944	$ 84,937
Denominator:
Denominator for basic earnings per share attributable to controlling interest-weighted average common shares	57,716	61,503	58,226	61,976
Effect of dilutive securities	1,622	1,965	1,787	2,068
Denominator for diluted earnings per share attributable to controlling interest-adjusted weighted average common shares	59,338	63,468	60,013	64,044
Basic earnings per share attributable to controlling interest	$ 0.59	$ 0.64	$ 1.53	$ 1.37
Diluted earnings per share attributable to controlling interest	$ 0.57	$ 0.62	$ 1.48	$ 1.33