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Summary of Significant Accounting Policies - Additional Information (Detail) |  | 12 Months Ended |
--- | --- | --- | ---
May 02, 2022 USD ($) | May 31, 2023 USD ($) Customer Facility Segment Jointventure | May 31, 2022 USD ($) Customer | May 31, 2021 USD ($) | Jun. 08, 2021
Significant Accounting Policies [Line Items] |  |  |  |  |
Equity method investment, purchase price |  |  | $ 6,811,000 |  |
Separation costs |  | $ 24,048,000 |  |  |
Derivative financial instruments, credit losses |  | $ 0 |  |  |
Number of manufacturing facilities operated | Facility |  | 28 |  |  |
Number of reportable segments | Segment |  | 4 |  |  |
Allowance for doubtful accounts increase (decrease) |  | $ 2,091,000 |  |  |
Receivables, allowances |  | 3,383,000 | 1,292,000 |  |
Depreciation Expenses |  | 93,961,000 | 83,272,000 | $ 74,779,000 |
Advertising Expenses |  | $ 29,537 | $ 21,613 | $ 17,462 |
Maximum |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |
Period allowed for payment of dues to customers |  |  | 60 days |  |
Maximum | Building and Building Improvements |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |
Property, plant and equipment, estimated useful life |  | 40 years |  |  |
Maximum | Machinery and Equipment |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |
Property, plant and equipment, estimated useful life |  | 20 years |  |  |
Minimum |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |
Period allowed for payment of dues to customers |  |  | 30 days |  |
Minimum | Building and Building Improvements |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |
Property, plant and equipment, estimated useful life |  | 10 years |  |  |
Minimum | Machinery and Equipment |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |
Property, plant and equipment, estimated useful life |  | 3 years |  |  |
Largest Customer |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |
Number of customers | Customer |  | 10 | 10 |  |
Sales Revenue, Net | Product Concentration Risk | Automotive Industries |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |
Concentration risk percentage |  | 37.00% | 37.00% | 37.00% |
Sales Revenue, Net | Foreign Operations | International Operations |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |
Concentration risk percentage |  | 13.00% | 6.00% | 7.00% |
Sales Revenue, Net | Customer Concentration Risk | Largest Customer |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |
Concentration risk percentage |  | 12.00% |  |  |
Sales Revenue, Net | Customer Concentration Risk | Largest Customer | Maximum |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |
Concentration risk percentage |  |  | 13.00% |  |
Sales Revenue, Net | Customer Concentration Risk | Ten Largest Customers |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |
Concentration risk percentage |  | 34.00% | 34.00% |  |
Net Assets, Geographic Area | Foreign Operations | International Operations |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |
Concentration risk percentage |  | 10.00% | 10.00% |  |
Workforce Subject to Collective Bargaining Arrangements | Labor Force Concentration Risk [Member] |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |
Concentration risk percentage |  | 15.00% |  |  |
Workhorse |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |
Percent of ownership interest held in unconsolidated affiliates |  | 20.00% |  |  |
Worthington Taylor, LLC |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |
Percent of ownership interest held in unconsolidated affiliates | 49.00% |  |  |  |
Equity method investment, purchase price | $ 6,811,000 |  |  |  |
Joint Venture Transactions |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |
Number of joint ventures | Jointventure |  | 3 |  |  |
Number of manufacturing facilities operated | Facility |  | 44 |  |  |
Spartan | Joint Venture Transactions |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |
Percent of controlling interest by the Company |  | 52.00% |  |  |
TWB |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |
Percent of controlling interest by the Company |  |  |  |  | 55.00%
TWB | Joint Venture Transactions |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |
Percent of controlling interest by the Company |  | 55.00% |  |  |
Samuel | Joint Venture Transactions |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |
Percent of controlling interest by the Company |  |  | 63.00% |  |
Worthington Specialty Processing | Joint Venture Transactions |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |
Percent of controlling interest by the Company |  | 51.00% |  |  |

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