Long-Term Debt - Narrative (Detail)	12 Months Ended
May 31, 2020 JPY (¥)
Corporate Bond Payables
Debt Instrument [Line Items]
Percent of aggregate principal amount of the notes to be redeemed	100.00%
Notes Payable \| 2.6% and 2.0% Japanese Yen note, maturing August 20, 2001 through November 20, 2020
Debt Instrument [Line Items]
Long-term debt, original principal	¥ 13,000,000,000.0

Face (par) amount of debt instrument at time of issuance.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=114775744&loc=d3e28551-108399

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 55
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=114775985&loc=d3e28878-108400

Name:	us-gaap_DebtInstrumentFaceAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant