For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
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Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
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Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
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Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
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Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
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-URI https://asc.fasb.org/extlink&oid=99393423&loc=d3e6404-108592

Name:	us-gaap_ConcentrationRiskPercentage1
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

Segment Data - Additional Information (Detail)	12 Months Ended
Segment Data - Additional Information (Detail)	May 31, 2023 Segment Jointventure	May 31, 2022	May 31, 2021
Segment Reporting Information [Line Items]
Number of reportable segments	4
Joint Venture Transactions
Segment Reporting Information [Line Items]
Number of joint ventures \| Jointventure	3
Pressure Cylinders
Segment Reporting Information [Line Items]
Number of reportable segments	3
Steel Processing \| Sales Revenue, Net \| Product Concentration Risk
Segment Reporting Information [Line Items]
Concentration risk percentage	71.10%	75.00%	64.90%
Consumer products \| Sales Revenue, Net \| Product Concentration Risk
Segment Reporting Information [Line Items]
Concentration risk percentage	14.00%	12.10%	16.50%
Building Products \| Sales Revenue, Net \| Product Concentration Risk
Segment Reporting Information [Line Items]
Concentration risk percentage	11.90%	10.30%	12.70%
Sustainable Energy Solutions \| Sales Revenue, Net \| Product Concentration Risk
Segment Reporting Information [Line Items]
Concentration risk percentage	3.00%	2.50%	4.30%