XML 33 R43.htm IDEA: XBRL DOCUMENT v2.4.0.8
Note 4 - Fair Value of Financial Instruments and Long Term Debt (Details) - Long-term Debt at Carrying Amount (USD $)
In Thousands, unless otherwise specified
Apr. 30, 2014
Apr. 30, 2013
Note 4 - Fair Value of Financial Instruments and Long Term Debt (Details) - Long-term Debt at Carrying Amount [Line Items]    
Senior Notes $ 854,195 $ 668,891
Less current maturities 553 15,810
853,642 653,081
Capital Lease Obligations [Member]
    
Note 4 - Fair Value of Financial Instruments and Long Term Debt (Details) - Long-term Debt at Carrying Amount [Line Items]    
Capitalized lease obligations discounted at 5.22% to 7.09% due in various monthly installments through 2048 (Note 8) 10,195 9,891
Senior Notes 5.72% [Member]
    
Note 4 - Fair Value of Financial Instruments and Long Term Debt (Details) - Long-term Debt at Carrying Amount [Line Items]    
Senior Notes 75,000 90,000
Senior Notes 5.22% [Member]
    
Note 4 - Fair Value of Financial Instruments and Long Term Debt (Details) - Long-term Debt at Carrying Amount [Line Items]    
Senior Notes 569,000 569,000
Senior Notes Series A, 3.67% [Member]
    
Note 4 - Fair Value of Financial Instruments and Long Term Debt (Details) - Long-term Debt at Carrying Amount [Line Items]    
Senior Notes 150,000  
Senior Notes Series B, 3.75% [Member]
    
Note 4 - Fair Value of Financial Instruments and Long Term Debt (Details) - Long-term Debt at Carrying Amount [Line Items]    
Senior Notes $ 50,000