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Restructuring Liability (Schedule Of Changes In Restructuring Liability) (Details) (USD $)
3 Months Ended
Jul. 31, 2011
Apr. 30, 2011
Liability as of April 30, 2011 $ 4,921,000  
Reductions for cash payments (1,027,000)  
Exchange rate fluctuations (74,000)  
Liability as of July 31, 2011 3,820,000  
Restructuring liability included in other long-term liabilities 1,700,000 2,100,000
Long-term restructuring liability, payment term seven years seven years
Severance [Member]
   
Liability as of April 30, 2011 978,000  
Reductions for cash payments (255,000)  
Exchange rate fluctuations (9,000)  
Liability as of July 31, 2011 714,000  
Facilities [Member]
   
Liability as of April 30, 2011 3,943,000  
Reductions for cash payments (772,000)  
Exchange rate fluctuations (65,000)  
Liability as of July 31, 2011 $ 3,106,000