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, 2017	Nov. 30, 2016	Nov. 30, 2017	Nov. 30, 2016
Numerator (basic & diluted):
Net earnings attributable to controlling interest -income available to common shareholders	$ 39,403	$ 46,565	$ 84,937	$ 112,132
Denominator:
Denominator for basic earnings per share attributable to controlling interest - weighted average common shares	61,503	62,348	61,976	62,115
Effect of dilutive securities	1,965	2,377	2,068	2,484
Denominator for diluted earnings per share attributable to controlling interest - adjusted weighted average common shares	63,468	64,725	64,044	64,599
Basic earnings per share attributable to controlling interest	$ 0.64	$ 0.75	$ 1.37	$ 1.81
Diluted earnings per share attributable to controlling interest	$ 0.62	$ 0.72	$ 1.33	$ 1.74