Earnings Per Share - Computation of Basic and Diluted Earnings Per Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended								12 Months Ended
	May 31, 2021	Feb. 28, 2021	Nov. 30, 2020	Aug. 31, 2020	May 31, 2020	Feb. 29, 2020	Nov. 30, 2019	Aug. 31, 2019	May 31, 2021	May 31, 2020	May 31, 2019
Numerator (basic & diluted):
Net earnings attributable to controlling interest - income available to common shareholders	$ 113,555	$ 67,609	$ (74,044)	$ 616,675	$ 16,175	$ 15,311	$ 52,086	$ (4,776)	$ 723,795	$ 78,796	$ 153,455
Denominator:
Denominator for basic earnings per share attributable to controlling interest-weighted average common shares									52,701	54,958	57,196
Effect of dilutive securities									1,216	1,025	1,627
Denominator for diluted earnings per share attributable to controlling interest-adjusted weighted average common shares									53,917	55,983	58,823
Basic earnings per share attributable to controlling interest	$ 2.20	$ 1.30	$ (1.40)	$ 11.41	$ 0.30	$ 0.28	$ 0.95	$ (0.09)	$ 13.73	$ 1.43	$ 2.68
Diluted earnings per share attributable to controlling interest	$ 2.15	$ 1.27	$ (1.40)	$ 11.22	$ 0.29	$ 0.27	$ 0.93	$ (0.09)	$ 13.42	$ 1.41	$ 2.61