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Revenue Recognition - Revenue by Product Class and Timing (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
May 31, 2023 | May 31, 2022 | May 31, 2021
Disaggregation Of Revenue [Line Items] |  |  |
Net sales | $ 4,916,392 | $ 5,242,219 | $ 3,171,429
Over time revenue |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Net sales | 140,781 | 144,732 | 147,645
Steel Processing |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Net sales | 3,497,896 | 3,933,021 | 2,059,397
Other |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Net sales |  | 9 | 51,407
Direct | Steel Processing |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Net sales | 3,357,115 | 3,788,289 | 1,927,418
Toll | Steel Processing |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Net sales | 140,781 | 144,732 | 131,979
Toll | Steel Processing | Over time revenue |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Net sales | 140,781 | 144,732 | 131,979
Consumer products |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Net sales | 686,319 | 636,478 | 523,697
Building Products |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Net sales | 586,059 | 541,757 | 402,038
Sustainable Energy Solutions |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Net sales | $ 146,118 | 130,954 | 134,890
Oil & Gas Equipment | Other |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Net sales |  |  | 20,950
Engineered Cabs | Other |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Net sales |  |  | 1,058
Other | Other |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Net sales |  | $ 9 | 29,399
Certain oil & gas contracts | Over time revenue |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Net sales |  |  | $ 15,666

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- Definition Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 30 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=126901519&loc=d3e8906-108599 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 40 -URI https://asc.fasb.org/extlink&oid=126901519&loc=d3e9031-108599 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 41 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=126901519&loc=d3e9038-108599 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 32 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=126901519&loc=d3e8933-108599 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 32 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=126901519&loc=d3e8933-108599 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=126920106&loc=SL49130543-203045 Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=126901519&loc=d3e8736-108599 Reference 8: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=126901519&loc=d3e8736-108599 Reference 9: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 42 -URI https://asc.fasb.org/extlink&oid=126901519&loc=d3e9054-108599 Reference 10: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 5 -URI https://asc.fasb.org/extlink&oid=126920106&loc=SL49130545-203045 Reference 11: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 924 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 11.L) -URI https://asc.fasb.org/extlink&oid=6472922&loc=d3e499488-122856 + Details
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