Earnings Per Share - Additional Information (Detail) - $ / shares	May 31, 2019	May 31, 2018	Oct. 01, 2014
Earnings Per Share [Abstract]
Warrants outstanding (in shares)	10,965,630	10,965,630
Exercise price per share (in dollars per share)	$ 101.65	$ 101.65	$ 101.65

Exercise price per share or per unit of warrants or rights outstanding.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(i)(4))
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

Name:	us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
Namespace Prefix:	us-gaap_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	instant