Summary of Unaudited Quarterly Consolidated Results of Operations (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended												12 Months Ended
	May 31, 2017	Feb. 28, 2017	Nov. 30, 2016	Aug. 31, 2016	May 31, 2016		Feb. 29, 2016		Nov. 30, 2015		Aug. 31, 2015		May 31, 2017	May 31, 2016	May 31, 2015
Quarterly Financial Information [Line Items]
Net sales	$ 845,343	$ 703,436	$ 727,780	$ 737,549	$ 714,671		$ 647,080		$ 699,816		$ 758,147		$ 3,014,108	$ 2,819,714	$ 3,384,234
Gross margin	154,830	110,990	122,803	147,282	134,475		95,923		109,179		113,016		535,905	452,593	463,533
Impairment of long-lived assets									22,962	[1]	3,000	[1]		25,962	100,129
Net earnings	60,583	38,951	49,867	68,536	62,738	[2]	34,143	[2]	25,752	[2]	34,995	[2]	217,937	157,628	87,256
Net earnings attributable to controlling interest	$ 56,494	$ 35,889	$ 46,565	$ 65,567	$ 58,523	[2]	$ 29,847	[2]	$ 23,376	[2]	$ 31,968	[2]	$ 204,515	$ 143,715	$ 76,785
Earnings per share - basic	$ 0.90	$ 0.57	$ 0.75	$ 1.06	$ 0.95	[2]	$ 0.48	[2]	$ 0.37	[2]	$ 0.50	[2]	$ 3.28	$ 2.30	$ 1.16
Earnings per share - diluted	$ 0.87	$ 0.55	$ 0.72	$ 1.02	$ 0.92	[2]	$ 0.47	[2]	$ 0.36	[2]	$ 0.48	[2]	$ 3.15	$ 2.22	$ 1.12

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

[2] Amounts are presented on a revised basis due to the adoption of amended accounting guidance related to the accounting for share-based payments in the fourth quarter of fiscal 2016. As a result of the adoption of this amended accounting guidance, net earnings and net earnings attributable to controlling interest for the three month periods ended August 31, 2015, November 30, 2015 and February 29, 2016 increased $558,000, $136,000 and $271,000, respectively, from the previously reported results.