Quarterly report pursuant to Section 13 or 15(d)

Comprehensive Income (Schedule Of Comprehensive Income) (Details)

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Comprehensive Income (Schedule Of Comprehensive Income) (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Jan. 31, 2012
Jan. 31, 2011
Jan. 31, 2012
Jan. 31, 2011
Comprehensive Income [Abstract]        
Net income $ 11,717 $ 13,975 $ 42,275 $ 38,535
Foreign currency translation adjustments (7,973) (185) (14,967) 3,789
Unrealized gains (losses) on marketable securities, net of taxes 47 (63) (42) (22)
Comprehensive income $ 3,791 $ 13,727 $ 27,266 $ 42,302