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Debt and Receivables Securitization - Additional Information (Detail) (USD $)
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9 Months Ended |
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Feb. 28, 2014
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Worthington Aritas
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| Debt And Receivables Securitization [Line Items] |
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| Maximum borrowing capacity |
$ 2,900,000 |
| Maturity date |
2014-04 |
| Borrowings outstanding |
554,000 |
| Applicable fixed rate |
5.75% |
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Worthington Nitin Cylinders Limited
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| Debt And Receivables Securitization [Line Items] |
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| Maximum borrowing capacity |
9,500,000 |
| Maturity date |
2014-11 |
| Borrowings outstanding |
5,072,000 |
| Applicable variable rate |
2.25% |
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Line of Credit | Maximum
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| Debt And Receivables Securitization [Line Items] |
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| Debt maturity period |
1 year |
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Unsecured Revolving Credit Facility
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| Debt And Receivables Securitization [Line Items] |
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| Maximum borrowing capacity |
425,000,000 |
| Maturity date |
2017-05 |
| Borrowings outstanding |
9,730,000 |
| Remaining borrowing capacity |
403,538,000 |
| Applicable variable rate |
1.21% |
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Accounts Receivable Facilities
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| Debt And Receivables Securitization [Line Items] |
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| Maximum borrowing capacity |
100,000,000 |
| Maturity date |
2015-01 |
| Borrowings outstanding |
20,000,000 |
| Number of days past due trade accounts receivables are ineligible for securitization |
90 days |
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Financial Stand-By Letters Of Credit
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| Debt And Receivables Securitization [Line Items] |
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| Outstanding stand-by letters of credit amount for third-party beneficiaries |
14,254,000 |
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Financial Stand-By Letters Of Credit | Unsecured Revolving Credit Facility
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| Debt And Receivables Securitization [Line Items] |
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| Outstanding stand-by letters of credit amount for third-party beneficiaries |
$ 11,732,000 |