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CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $)
In Thousands, except Share data, unless otherwise specified
12 Months Ended
Apr. 30, 2014
Apr. 30, 2013
ASSETS    
SUPPLEMENTAL TYPE CERTIFICATES, amortization $ 2,841 $ 2,642
OTHER ASSETS    
Other assets, accumulated amortization 2,520 1,203
STOCKHOLDERS' EQUITY:    
Common stock, par value (in dollars per share) $ 0.01 $ 0.01
Common stock, shares authorized (in shares) 100,000,000 100,000,000
Common stock, shares issued (in shares) 61,493,092 59,619,173
Common stock, shares outstanding (in shares) 61,493,092 59,619,173
Common stock, shares owed but not issued (in shares) 0 0
Treasury stock (in shares) 600,000 600,000
Class A [Member]
   
STOCKHOLDERS' EQUITY:    
Preferred stock, par value (in dollars per share) $ 5 $ 5
Preferred stock, shares authorized (in shares) 50,000,000 50,000,000
Preferred stock, stated value (in dollars per share) $ 100 $ 100
Preferred stock, dividend rate (in hundredths) 9.80% 9.80%
Preferred stock, liquidation preference value (in hundredths) 9.80% 9.80%
Preferred stock, redemption value 100 100
Preferred stock, shares issued (in shares) 0 0
Preferred stock, shares outstanding (in shares) 0 0
Class B [Member]
   
STOCKHOLDERS' EQUITY:    
Preferred stock, par value (in dollars per share) $ 5 $ 5
Preferred stock, shares authorized (in shares) 50,000,000 50,000,000
Preferred stock, stated value (in dollars per share) $ 1,000 $ 1,000
Preferred stock, dividend rate (in hundredths) 6.00% 6.00%
Preferred stock, liquidation preference value (in hundredths) 6.00% 6.00%
Preferred stock, redemption value $ 1,000 $ 1,000
Preferred stock, shares issued (in shares) 0 0
Preferred stock, shares outstanding (in shares) 0 0
Class A and B [Member]
   
STOCKHOLDERS' EQUITY:    
Preferred stock, designated classes (in shares) 200,000 200,000