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Segment Data - Additional Information (Detail) | 12 Months Ended
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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%

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