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Stock-Based Compensation - Summary of Performance Share Award Activity (Detail) - Performance Award Activity - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands | 12 Months Ended
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May 31, 2026 | May 31, 2025 | May 31, 2024
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward] |  |  |  |
Outstanding, beginning of year |  | 73,780 | 140,526 | 171,474
Converted to Worthington Steel common shares | [1] |  |  | (38,900)
Separation related adjustment |  |  |  | 59,232
Granted | [2] | 53,130 | 75,854 | 116,353
Vested |  | (23,324) | (71,173) | (145,464)
Forfeited |  | (3,577) | (71,427) | (22,169)
Outstanding, end of year |  | 100,009 | 73,780 | 140,526
Weighted Average Grant Date Fair Value |  |  |  |
Outstanding, beginning of year |  | $ 41.16 | $ 37.55 | $ 46.37
Converted to Worthington Steel common shares | [1] |  |  | 56.99
Granted | [2] | 63.89 | 41.34 | 52.36
Vested |  | 32.57 | 37.74 | 38.91
Forfeited |  | 33.03 | 37.66 | 40.18
Outstanding, end of year |  | $ 55.73 | $ 41.16 | $ 37.55
Weighted Average Remaining Contractual Life (in years) |  |  |  |
Weighted average remaining contractual life of outstanding restricted common shares (in years) |  | 1 year 9 months 29 days | 1 year 6 months 3 days | 1 year 5 months 4 days
Aggregate intrinsic value |  |  |  |
Aggregate intrinsic value of outstanding restricted common shares |  | $ 5,678 | $ 4,346 | $ 8,014
Aggregate intrinsic value of restricted common shares vested during the year |  | $ 3,439 | $ 3,395 | $ 10,165
[1] | Effective as of the Distribution, each performance share award held by an employee or director of Worthington Steel was converted into a restricted stock award covering Worthington Steel shares.
[2] | Includes common shares related to previously granted awards that paid out at percentages above target levels.

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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(03) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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- Definition Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(03) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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- Definition The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(01) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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- Definition The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(01) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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- Definition The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(2)(i) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(2)(ii) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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- Definition Per share or unit weighted-average fair value of nonvested award under share-based payment arrangement. Excludes share and unit options. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(2)(i) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(2)(ii) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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- Definition Weighted average remaining contractual term for equity-based awards excluding options, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 718 -SubTopic 10 -Subparagraph (e)(1) -Name Accounting Standards Codification -Paragraph 2 -Section 50 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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