Supplemental Cash Flow Information (Detail) - USD ($) $ in Thousands	12 Months Ended
May 31, 2017	May 31, 2016	May 31, 2015
Cash Flow Supplemental Disclosures [Line Items]
Interest paid, net of amount capitalized	$ 29,826	$ 30,431	$ 36,190
Income taxes paid, net of refunds	$ 55,652	$ 50,750	$ 67,825

The amount of cash paid during the current period to foreign, federal, state, and local authorities as taxes on income, net of any cash received during the current period as refunds for the overpayment of taxes.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4297-108586

Name:	us-gaap_IncomeTaxesPaidNet
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration