Quarterly report pursuant to Section 13 or 15(d)

Comprehensive Income (Schedule Of Accumulated Other Comprehensive Income) (Details)

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Comprehensive Income (Schedule Of Accumulated Other Comprehensive Income) (Details) (USD $)
In Thousands, unless otherwise specified
Jan. 31, 2012
Apr. 30, 2011
Comprehensive Income [Abstract]    
Foreign currency translation adjustments $ 20,672 $ 35,639
Defined benefit pension adjustments, net of taxes (10,014) (10,014)
Unrealized (losses) gains on marketable securities, net of taxes (7) 35
Accumulated other comprehensive income $ 10,651 $ 25,660