Contractual interest rate for funds borrowed, under the debt agreement.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.22(a)(1))

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 22

-Article 5

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Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.22(a)(2))

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 22

-Article 5

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Debt Instrument, Maturity, Month and Year

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Summary of Long-term Debt and Short-term Borrowings Outstanding (Parenthetical) (Detail)			12 Months Ended
	Apr. 15, 2014	Aug. 10, 2012	May. 31, 2015	May. 31, 2014
Floating rate senior notes due December 17, 2014
Debt Instrument [Line Items]
Debt, maturity date			Dec. 17, 2014	Dec. 17, 2014
6.50% senior notes due April 15, 2020
Debt Instrument [Line Items]
Debt, interest rate			6.50%	6.50%
Debt, maturity date			Apr. 15, 2020	Apr. 15, 2020
4.60% senior notes due August 10, 2024
Debt Instrument [Line Items]
Debt, interest rate		4.60%	4.60%	4.60%
Debt, maturity date		Aug. 10, 2024	Aug. 10, 2024	Aug. 10, 2024
Unsecured Senior Notes, Four Point Five Five Percent, Due April Fifteen Twenty Twenty Six
Debt Instrument [Line Items]
Debt, interest rate	4.55%		4.55%	4.55%
Debt, maturity date	Apr. 15, 2026		Apr. 15, 2026	Apr. 15, 2026
Industrial revenue bonds due April 2019
Debt Instrument [Line Items]
Debt, maturity date (year and month)			2019-04	2019-04