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Basis of Presentation - Additional Information (Detail) (USD $)
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9 Months Ended | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|
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Feb. 28, 2014
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May 31, 2013
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Feb. 28, 2014
Metal Framing
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Mar. 01, 2011
Joint Venture Transactions
ClarkDietrich
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Feb. 28, 2014
Joint Venture Transactions
Worthington Aritas
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Feb. 28, 2014
Joint Venture Transactions
Spartan Steel Coating, LLC
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Feb. 28, 2014
Joint Venture Transactions
TWB
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Jul. 31, 2013
Joint Venture Transactions
TWB
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Feb. 28, 2014
Joint Venture Transactions
Worthington Energy Innovations, LLC
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Feb. 28, 2014
Joint Venture Transactions
Worthington Nitin Cylinders Limited
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| Basis of Presentation [Line Items] | ||||||||||
| Percent of controlling interest by the company | 75.00% | 52.00% | 55.00% | 55.00% | 75.00% | 60.00% | ||||
| Percentage of additional interest acquired by the company | 10.00% | 10.00% | ||||||||
| Purchase of additional interest | $ 17,869,000 | |||||||||
| Percent of interest by unconsolidated affiliates | 25.00% | |||||||||
| Assets held for sale | $ 2,435,000 | $ 3,040,000 | $ 2,435,000 | |||||||