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Note 4 - Fair Value Disclosure (Details) (USD $)	1 Months Ended
	Jun. 17, 2013	Jul. 31, 2013	Apr. 30, 2013	Apr. 30, 2012	Dec. 17, 2013 Subsequent Event [Member] Series B 3.75% Notes [Member]	Dec. 17, 2013 Subsequent Event [Member] Senior Notes [Member]
Note 4 - Fair Value Disclosure (Details) [Line Items]
Long-term Debt, Fair Value		$ 813,000,000		$ 721,000,000
Line of Credit Facility, Maximum Borrowing Capacity		100,000,000
Line of Credit Facility, Amount Outstanding		0	59,100,000
Debt, Weighted Average Interest Rate		0.95%
Senior Notes					50,000
Debt Instrument, Interest Rate, Stated Percentage						3.75%
Line of Credit Facility, Decrease, Forgiveness	$ 25,000

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- Definition

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

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 22

-Article 5



Reference 2: 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))

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- Definition

Weighted average interest rate of debt outstanding.

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No definition available.

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- Definition

Amount borrowed under the credit facility as of the balance sheet date.

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 19, 22

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- Definition

Amount of decrease in line of credit facility from forgiveness by the holder of the line of credit.

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- Definition

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.

+ 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 210.5-02.19(b),22(b))

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- Definition

The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission.

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- Definition

Including the current and noncurrent portions, carrying value as of the balance sheet date of Notes with the highest claim on the assets of the issuer in case of bankruptcy or liquidation (with maturities initially due after one year or beyond the operating cycle if longer). Senior note holders are paid off in full before any payments are made to junior note holders.

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-Publisher FASB

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-Topic 942

-SubTopic 210

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-Subparagraph (SX 210.9-03.16)

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