Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

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Date the entity entered into the derivative contract, in CCYY-MM-DD format.

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Date the derivative contract matures, in CCYY-MM-DD format.

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Fixed interest rate that will be received or paid upon exercise of the interest rate swaption contract.

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The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

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Period remaining on line of credit facility before it terminates, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).

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Reflects the total carrying amount as of the balance sheet date of debt having initial terms less than one year or the normal operating cycle, if longer.

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Debt Instrument Maturity Period 1

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Line of Credit Maturity Month and Year

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Trade Accounts Receivables Past Due Excluded From Securitization Period

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Debt and Receivables Securitization - Additional Information (Detail) (USD $)	3 Months Ended	9 Months Ended	0 Months Ended
	Feb. 28, 2015	Feb. 28, 2015	Oct. 15, 2014	Sep. 26, 2014	May 31, 2014
Debt And Receivables Securitization [Line Items]
Short-term borrowings	$ 123,054,000us-gaap_ShortTermBorrowings	$ 123,054,000us-gaap_ShortTermBorrowings			$ 10,362,000us-gaap_ShortTermBorrowings
Securities Sold under Agreements to Repurchase
Debt And Receivables Securitization [Line Items]
Maximum borrowing capacity	100,000,000	100,000,000
Borrowings outstanding	80,000,000	80,000,000
Maturity date	2018-01
Number of days past due trade accounts receivables are ineligible for securitization		90 days
Interest Rate Swap
Debt And Receivables Securitization [Line Items]
Borrowings outstanding			17,131,000
Interest rate swap, interest rate			2.015%
Interest rate swap, start date			Dec. 26, 2014
Interest rate swap, maturity date			Sep. 26, 2019
Unsecured Revolving Credit Facility
Debt And Receivables Securitization [Line Items]
Maximum borrowing capacity	425,000,000	425,000,000
Borrowings outstanding	33,840,000	33,840,000
Remaining borrowing capacity	391,160,000	391,160,000
Line of credit, variable rate	1.23%	1.23%
Maturity date		2017-05
Unsecured Revolving Credit Facility \| Maximum
Debt And Receivables Securitization [Line Items]
Debt maturity period		1 year
Worthington Aritas
Debt And Receivables Securitization [Line Items]
Maximum borrowing capacity				28,605,000
Term loan credit facility, term				5 years
Borrowings outstanding	23,432,000	23,432,000
Remaining borrowing capacity	5,173,000	5,173,000
Line of credit, variable rate	1.569%	1.569%
Maturity date		2015-05
Short-term borrowings	3,305,000	3,305,000
Debt, Interest rate	5.55%	5.55%
Worthington Nitin Cylinders
Debt And Receivables Securitization [Line Items]
Maximum borrowing capacity	9,500,000	9,500,000
Line of credit, variable rate	9.05%	9.05%
Maturity date		2014-11
Short-term borrowings	$ 5,909,000	$ 5,909,000