Quarterly Results of Operations (Unaudited) - Summary of Unaudited Quarterly Consolidated Results of Operations (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended										12 Months Ended
	May 31, 2018		Feb. 28, 2018	Nov. 30, 2017		Aug. 31, 2017	May 31, 2017	Feb. 28, 2017	Nov. 30, 2016	Aug. 31, 2016	May 31, 2018	May 31, 2017	May 31, 2016
Quarterly Financial Information Disclosure [Abstract]
Net sales	$ 1,020,460		$ 841,657	$ 871,266		$ 848,237	$ 845,343	$ 703,436	$ 727,780	$ 737,549	$ 3,581,620	$ 3,014,108	$ 2,819,714
Gross margin	162,946		127,055	140,079		132,778	154,830	110,990	122,803	147,282	562,857	535,905	452,593
Impairment of goodwill and long-lived assets	52,919	[1]		8,289	[1]						61,208		25,962
Net earnings	32,857		78,297	41,622		48,074	60,583	38,951	49,867	68,536	200,850	217,937	157,628
Net earnings attributable to controlling interest	$ 30,770		$ 79,087	$ 39,403		$ 45,534	$ 56,494	$ 35,889	$ 46,565	$ 65,567	$ 194,794	$ 204,515	$ 143,715
Earnings per share attributable to controlling interest	$ 0.52		$ 1.31	$ 0.64		$ 0.73	$ 0.90	$ 0.57	$ 0.75	$ 1.06	$ 3.20	$ 3.28	$ 2.30
Earnings per share attributable to controlling interest	$ 0.50		$ 1.27	$ 0.62		$ 0.70	$ 0.87	$ 0.55	$ 0.72	$ 1.02	$ 3.09	$ 3.15	$ 2.22

[1] For additional information regarding the Company’s impairment activity, refer to “Note C – Goodwill and Other Long-Lived Assets.”