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Reconciliation of Segment Identifiable Assets to Consolidated Assets (Detail) (USD $)
In Thousands, unless otherwise specified
Oct. 31, 2012
Apr. 30, 2012
Segment Reporting, Asset Reconciling Item [Line Items]    
Assets $ 110,718 $ 106,227
FEI-NY (approximately $3 million in China)
   
Segment Reporting, Asset Reconciling Item [Line Items]    
Assets 54,312 50,234
Gillam-FEI (all in Belgium or France)
   
Segment Reporting, Asset Reconciling Item [Line Items]    
Assets 19,509 20,407
FEI-Zyfer
   
Segment Reporting, Asset Reconciling Item [Line Items]    
Assets 7,577 9,685
Inter Segment
   
Segment Reporting, Asset Reconciling Item [Line Items]    
Assets (14,832) (16,424)
Corporate
   
Segment Reporting, Asset Reconciling Item [Line Items]    
Assets $ 44,152 $ 42,325