Revenue Recognition - Schedule of Adjustments on Consolidated Financial Statements (Detail) - USD ($) $ in Thousands	3 Months Ended				6 Months Ended
	Nov. 30, 2018	Aug. 31, 2018	Nov. 30, 2017	Aug. 31, 2017	Nov. 30, 2018	Nov. 30, 2017	Jun. 01, 2018	May 31, 2018
Assets
Receivables	$ 518,006				$ 518,006			$ 572,689
Total inventories	488,742				488,742			454,027
Prepaid expenses and other current assets	62,367				62,367			60,134
Liabilities and equity
Income taxes payable	1,276				1,276			4,593
Deferred income taxes, net	81,001				81,001			60,188
Shareholders' equity - controlling interest	868,672				868,672			918,769
Noncontrolling interests	117,583				117,583			$ 117,606
Consolidated Statement of Earnings
Net sales	958,226		$ 871,266		1,946,333	$ 1,719,503
Cost of goods sold	837,292		731,187		1,682,402	1,446,646
Income tax expense	11,119		18,165		25,617	31,163
Net earnings	37,792	$ 56,958	41,622	$ 48,074	94,750	89,696
Net earnings attributable to noncontrolling interests	3,790		2,219		5,806	4,759
Net earnings attributable to controlling interest	34,002		$ 39,403		88,944	$ 84,937
Accounting Standards Update 2014-09
Assets
Receivables							$ 577,395
Total inventories							450,575
Prepaid expenses and other current assets							61,078
Liabilities and equity
Deferred income taxes, net							60,642
Noncontrolling interests							118,176
Accounting Standards Update 2014-09 | Topic 606 Adjustments
Assets
Receivables	(4,750)				(4,750)		4,706
Total inventories	6,376				6,376		(3,452)
Prepaid expenses and other current assets	(4,556)				(4,556)		944
Liabilities and equity
Income taxes payable	(106)				(106)
Deferred income taxes, net	(454)				(454)		454
Shareholders' equity - controlling interest	(1,753)				(1,753)
Noncontrolling interests	(617)				(617)		$ 570
Consolidated Statement of Earnings
Net sales	(2,793)				(3,656)
Cost of goods sold	2,320				2,924
Income tax expense	110				106
Net earnings	(363)				(626)
Net earnings attributable to noncontrolling interests	(24)				(48)
Net earnings attributable to controlling interest	(339)				(578)
Accounting Standards Update 2014-09 | Balances Without Adoption of Topic 606
Assets
Receivables	513,256				513,256
Total inventories	495,118				495,118
Prepaid expenses and other current assets	57,811				57,811
Liabilities and equity
Income taxes payable	1,170				1,170
Deferred income taxes, net	80,547				80,547
Shareholders' equity - controlling interest	866,919				866,919
Noncontrolling interests	116,966				116,966
Consolidated Statement of Earnings
Net sales	955,433				1,942,677
Cost of goods sold	839,612				1,685,326
Income tax expense	11,229				25,723
Net earnings	37,429				94,124
Net earnings attributable to noncontrolling interests	3,766				5,758
Net earnings attributable to controlling interest	$ 33,663				$ 88,366