Annual report pursuant to Section 13 and 15(d)

Stock Options and SAR Transactions (Detail)

v2.4.0.6
Stock Options and SAR Transactions (Detail) (Stock Options, USD $)
12 Months Ended
Apr. 30, 2013
Apr. 30, 2012
Apr. 30, 2011
Stock Options
     
Options      
Outstanding, beginning of year 1,492,000 1,833,000 2,723,000
Granted   48,000 211,000
Exercised (238,000) (235,000) (625,000)
Forfeited/expired (154,000) (154,000) (476,000)
Outstanding, end of year 1,100,000 1,492,000 1,833,000
Exercisable, end of year 864,000 1,061,000 1,219,000
Weighted Average Exercise Price      
Outstanding, beginning of year $ 14.00 $ 13.78 $ 14.72
Granted   $ 22.71 $ 13.97
Exercised $ 9.32 $ 12.76 $ 12.81
Forfeited/expired $ 16.87 $ 15.63 $ 20.55
Outstanding, end of year $ 14.72 $ 14.00 $ 13.78
Exercisable, end of year $ 15.01 $ 14.33 $ 14.64