Reconciliation of 35% Federal Statutory Tax Rate to Total Tax Provision (Detail)	12 Months Ended
	May 31, 2017	May 31, 2016	May 31, 2015
Reconciliation of Statutory Federal Tax Rate [Line Items]
Federal statutory rate	35.00%	35.00%	35.00%
State and local income taxes, net of federal tax benefit	1.80%	2.60%	3.00%
Change in state and local valuation allowances	(0.30%)	(1.10%)	(1.10%)
Non-U.S. income taxes at other than 35%	(2.10%)	(3.50%)	(0.70%)
Change in Non-U.S. valuation allowances	0.70%	0.50%	1.20%
Qualified production activities deduction	(1.90%)	(2.20%)	(5.90%)
Research & development credits	(0.10%)	(0.20%)	(0.20%)
Benefit related to foreign tax credits	(0.50%)		(5.30%)
Excess benefit related to share-based payment awards	(5.70%)	(1.60%)
Other	1.00%	(0.40%)	(0.90%)
Effective tax rate attributable to controlling interest	27.90%	29.10%	25.10%