Quarterly report pursuant to Section 13 or 15(d)

Employee Stock Plans (Additional Information Stock Options And SARs) (Details)

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Employee Stock Plans (Additional Information Stock Options And SARs) (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
3 Months Ended 9 Months Ended
Jan. 31, 2012
Jan. 31, 2011
Jan. 31, 2012
Jan. 31, 2011
Employee Stock Plans [Abstract]        
Weighted-average fair value of stock options granted   $ 7.81 $ 9.61 $ 6.07
Total fair value of stock options and SARs vested $ 20 $ 27 $ 914 $ 642
Total intrinsic value of stock options exercised 127 3,330 986 4,015
Total intrinsic value of SARs paid $ 34   $ 45 $ 67