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
	Aug. 31, 2016	Aug. 31, 2015
Numerator (basic & diluted):
Net earnings attributable to controlling interest - income available to common shareholders	$ 65,567	$ 31,968
Denominator:
Denominator for basic earnings per share attributable to controlling interest - weighted average common shares	61,885	63,993
Effect of dilutive securities	2,452	2,072
Denominator for diluted earnings per share attributable to controlling interest - adjusted weighted average common shares	64,337	66,065
Basic earnings per share attributable to controlling interest	$ 1.06	$ 0.50
Diluted earnings per share attributable to controlling interest	$ 1.02	$ 0.48