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. 28, 2017	Feb. 29, 2016	Feb. 28, 2017	Feb. 29, 2016
Numerator (basic & diluted):
Net earnings attributable to controlling interest-income available to common shareholders	$ 35,889	$ 29,847	$ 148,021	$ 85,191
Denominator:
Denominator for basic earnings per share attributable to controlling interest-weighted average common shares	62,750	61,747	62,325	62,810
Effect of dilutive securities	2,227	2,124	2,433	2,113
Denominator for diluted earnings per share attributable to controlling interest-adjusted weighted average common shares	64,977	63,871	64,758	64,923
Basic earnings per share attributable to controlling interest	$ 0.57	$ 0.48	$ 2.37	$ 1.36
Diluted earnings per share attributable to controlling interest	$ 0.55	$ 0.47	$ 2.29	$ 1.31