Quarterly report pursuant to Section 13 or 15(d)

Employee Stock Plans (Restricted Stock Activity) (Details)

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Employee Stock Plans (Restricted Stock Activity) (Details) (Restricted Stock [Member], USD $)
In Thousands, except Per Share data, unless otherwise specified
9 Months Ended
Jan. 31, 2012
Restricted Stock [Member]
 
Restricted Stock Activity [Line Items]  
Shares, Non-vested, April 30, 2011 2,007
Shares, Granted 624
Shares, Vested (750)
Shares, Forfeited/expired (76)
Shares, Non-vested, January 31, 2012 1,805
Weighted-Average Grant Date Fair Value, Non-vested, April 30, 2011 $ 8.64
Weighted-Average Grant Date Fair Value, Granted $ 21.96
Weighted-Average Grant Date Fair Value, Vested $ 12.17
Weighted-Average Grant Date Fair Value, Forfeited/expired $ 16.80
Weighted-Average Grant Date Fair Value, Non-vested, January 31, 2012 $ 11.43