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Note 4 - Fair Value of Financial Instruments and Long Term Debt (Tables)

12 Months Ended

Apr. 30, 2014

Fair Value Disclosures [Abstract]

Schedule of Debt [Table Text Block]

		As of April 30,
		2014				2013
Capitalized lease obligations discounted at 5.22% to 7.09% due in various monthly installments through 2048 (Note 8)		$	10,195				9,891
5.72% Senior notes due in 14 installments beginning September 30, 2012 and ending March 30, 2020			75,000				90,000
5.22% Senior notes due August 9, 2020			569,000				569,000
3.67% Senior notes (Series A) due in 7 installments beginning June 17, 2022, and ending June 15, 2028			150,000				—
3.75% Senior notes (Series B) due in 7 installments beginning December 17, 2022 and ending December 18, 2028			50,000				—
			854,195				668,891
Less current maturities			553				15,810
		$	853,642				653,081

Schedule of Maturities of Long-term Debt [Table Text Block]

Years ended April 30,		Capital Leases				Senior Notes				Total
2015		$	553				—				553
2016			398				15,000				15,398
2017			375				15,000				15,375
2018			396				15,000				15,396
2019			417				15,000				15,417
Thereafter			8,056				784,000				792,056
		$	10,195				844,000			$	854,195

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- Definition

Tabular disclosure of information pertaining to short-term and long-debt instruments or arrangements, including but not limited to identification of terms, features, collateral requirements and other information necessary to a fair presentation.

+ References

No definition available.

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- Definition

Tabular disclosure of the combined aggregate amount of maturities and sinking fund requirements for all long-term borrowings for each of the five years following the date of the latest balance sheet date presented.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 470

-SubTopic 10

-Section 50

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6802200&loc=d3e1835-112601

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