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Investments in Unconsolidated Affiliates - Additional Information (Detail) (USD $)
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9 Months Ended | 12 Months Ended | 9 Months Ended | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
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Feb. 28, 2014
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Feb. 28, 2014
WAVE
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May 31, 2013
WAVE
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Feb. 28, 2014
ClarkDietrich
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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
WAVE
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Feb. 28, 2014
Joint Venture Transactions
ArtiFlex
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Feb. 28, 2014
Joint Venture Transactions
ClarkDietrich
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Feb. 28, 2014
Joint Venture Transactions
Samuel Steel Pickling Company
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Feb. 28, 2014
Joint Venture Transactions
Seviacero
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Feb. 28, 2014
Joint Venture Transactions
Worthington Modern Steel Framing Manufacturing Co., Ltd.
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Feb. 28, 2014
Joint Venture Transactions
Worthington Specialty Processing
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Oct. 18, 2013
Joint Venture Transactions
Zhejiang Nisshin Worthington Precision Specialty Steel Co
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Oct. 18, 2013
Joint Venture Transactions
Zhejiang Nisshin Worthington Precision Specialty Steel Co
Maximum
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| Investments in and Advances to Affiliates [Line Items] | |||||||||||||||
| Percent of interest by unconsolidated affiliates | 50.00% | 50.00% | 25.00% | 31.25% | 50.00% | 40.00% | 51.00% | 10.00% | 34.00% | ||||||
| Percentage of additional interest acquired by the company | 10.00% | 10.00% | |||||||||||||
| Percent of controlling interest by the company | 55.00% | 55.00% | |||||||||||||
| Distributions from unconsolidated affiliates | $ 70,073,000 | ||||||||||||||
| Cumulative distributions in excess of investment | 62,387,000 | 63,187,000 | |||||||||||||
| Excess distributions from unconsolidated affiliates | $ 9,223,000 | $ 9,223,000 | |||||||||||||