Comprehensive Income (Loss) - Additional Information (Detail) $ in Thousands	12 Months Ended
May 31, 2018 USD ($)
Other Comprehensive Income Loss Net Of Tax Period Increase Decrease [Abstract]
Gains in accumulated other comprehensive income, estimate of time of transfer	12 months
Gains in accumulated other comprehensive income expected to be reclassified into net earnings	$ 5,775
Gains in accumulated other comprehensive income expected to be reclassified into net earnings, tax	$ 1,751

The estimated value of gains (losses), net anticipated to be transferred in the future from accumulated other comprehensive income into earnings.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 30
-Section 50
-Paragraph 6
-URI http://asc.fasb.org/extlink&oid=112277219&loc=d3e80845-113994

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