Annual report pursuant to Section 13 and 15(d)

Restricted Stock Activity (Detail)

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Restricted Stock Activity (Detail) (Restricted Stock, USD $)
In Thousands, except Per Share data, unless otherwise specified
12 Months Ended
Apr. 30, 2013
Apr. 30, 2012
Apr. 30, 2011
Restricted Stock
     
Restricted Stock Activity [Line Items]      
Shares, Non-vested, beginning of year 1,781 2,007 2,480
Shares, Granted 889 687 562
Shares, Vested (780) (794) (920)
Shares, Forfeited/expired (80) (119) (115)
Shares, Non-vested, end of year 1,810 1,781 2,007
Weighted-Average Grant Date Fair Value, Non-vested, beginning of year $ 9.85 $ 8.64 $ 9.93
Weighted-Average Grant Date Fair Value, Granted $ 13.93 $ 21.46 $ 15.12
Weighted-Average Grant Date Fair Value, Vested $ 14.10 $ 15.58 $ 15.32
Weighted-Average Grant Date Fair Value, Forfeited/expired $ 14.75 $ 18.19 $ 14.83
Weighted-Average Grant Date Fair Value, Non-vested, end of year $ 9.80 $ 9.85 $ 8.64