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, 2016	Nov. 30, 2015	Nov. 30, 2016	Nov. 30, 2015
Numerator (basic & diluted):
Net earnings attributable to controlling interest-income available to common shareholders	$ 46,565	$ 23,376	$ 112,132	$ 55,344
Denominator:
Denominator for basic earnings per share attributable to controlling interest-weighted average common shares	62,348	62,676	62,115	63,338
Effect of dilutive securities	2,377	1,987	2,484	2,012
Denominator for diluted earnings per share attributable to controlling interest-adjusted weighted average common shares	64,725	64,663	64,599	65,350
Basic earnings per share attributable to controlling interest	$ 0.75	$ 0.37	$ 1.81	$ 0.87
Diluted earnings per share attributable to controlling interest	$ 0.72	$ 0.36	$ 1.74	$ 0.85