Quarterly report pursuant to Section 13 or 15(d)

Restructuring Charges (Details)

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Restructuring Charges (Details) (USD $)
3 Months Ended 6 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Restructuring Charges        
Restructuring charges $ 8,522,000 $ 1,605,000 $ 9,786,000 $ 2,630,000
Reconciliation of restructuring liability        
Costs charged to expense 8,522,000 1,605,000 9,786,000 2,630,000
Workforce reduction
       
Restructuring Charges        
Restructuring charges     3,900,000  
Reconciliation of restructuring liability        
Costs charged to expense     3,900,000  
Film and Electrolytic
       
Restructuring Charges        
Restructuring charges 5,454,000 692,000 6,576,000 1,643,000
Reconciliation of restructuring liability        
Costs charged to expense 5,454,000 692,000 6,576,000 1,643,000
Tantalum
       
Restructuring Charges        
Restructuring charges 1,987,000 864,000 2,031,000 899,000
Reconciliation of restructuring liability        
Costs charged to expense 1,987,000 864,000 2,031,000 899,000
Manufacturing relocation costs
       
Restructuring Charges        
Restructuring charges 1,015,000 638,000 1,161,000 1,385,000
Reconciliation of restructuring liability        
Costs charged to expense 1,015,000 638,000 1,161,000 1,385,000
Costs paid or settled (1,015,000) (638,000) (1,161,000) (1,385,000)
Manufacturing relocation costs | China and Mexico
       
Restructuring Charges        
Restructuring charges       1,400,000
Reconciliation of restructuring liability        
Costs charged to expense       1,400,000
Manufacturing relocation costs | Bulgaria, China, Macedonia and Mexico
       
Restructuring Charges        
Restructuring charges     1,200,000  
Reconciliation of restructuring liability        
Costs charged to expense     1,200,000  
Personnel reduction costs
       
Restructuring Charges        
Restructuring charges 7,507,000 967,000 8,625,000 1,245,000
Reconciliation of restructuring liability        
Beginning of period 11,184,000 1,751,000 11,474,000 1,827,000
Costs charged to expense 7,507,000 967,000 8,625,000 1,245,000
Costs paid or settled (4,048,000) (1,529,000) (4,851,000) (1,906,000)
Change in foreign exchange 376,000 (68,000) (229,000) (45,000)
End of period 15,019,000 1,121,000 15,019,000 1,121,000
Personnel reduction costs | Film and Electrolytic | Landsberg, Germany
       
Restructuring Charges        
Restructuring charges     2,800,000  
Reconciliation of restructuring liability        
Costs charged to expense     2,800,000  
Personnel reduction costs | Film and Electrolytic | Weymouth, United Kingdom
       
Restructuring Charges        
Restructuring charges     1,700,000  
Expected termination benefits/charges     2,600,000  
Reconciliation of restructuring liability        
Costs charged to expense     1,700,000  
Personnel reduction costs | Tantalum | Mexican operations
       
Restructuring Charges        
Restructuring charges       1,200,000
Reconciliation of restructuring liability        
Costs charged to expense       $ 1,200,000