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Commitments and Contingencies (Details) (USD $)
6 Months Ended
Oct. 31, 2012
Claims
Cases
Apr. 30, 2012
Oct. 31, 2011
Oct. 31, 2010
Commitments and Contingencies (Textual) [Abstract]        
Restricted cash $ 3,340,000 $ 3,334,000    
Commitments and Contingencies (Additional Textual) [Abstract]        
Number of Product liability cases 16      
Number of Other product liability claims 10      
Reserves related to the land and building 2,100,000   1,500,000  
Site remediation costs 2.4      
Environmental reserve in non-current liabilities 577,000     577,000
Letter of Credit [Member]
       
Commitments and Contingencies (Textual) [Abstract]        
Restricted cash 2,500,000      
Outstanding Letters of Credit 1,200,000      
Environmental remediation [Member]
       
Commitments and Contingencies (Textual) [Abstract]        
Restricted cash 812,000      
Minimum [Member]
       
Commitments and Contingencies (Textual) [Abstract]        
Compensatory damages sought 75,000      
Maximum [Member]
       
Commitments and Contingencies (Textual) [Abstract]        
Compensatory damages sought $ 1,400,000