Annual report pursuant to Section 13 and 15(d)

Pension and Other Post-retirement Benefit Plans (Details)

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Pension and Other Post-retirement Benefit Plans (Details) (USD $)
12 Months Ended 0 Months Ended 6 Months Ended 12 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Jul. 12, 2012
Film and Electrolytic
Jul. 12, 2012
Film and Electrolytic
Minimum
Mar. 31, 2013
Pension
Mar. 31, 2013
Pension
Mar. 31, 2012
Pension
Mar. 31, 2011
Pension
Mar. 31, 2013
Pension
Europe
plan
Mar. 31, 2013
Pension
Singapore
plan
Mar. 31, 2013
Pension
Mexico
plan
Mar. 31, 2013
Other Benefits
plan
Mar. 31, 2012
Other Benefits
Mar. 31, 2011
Other Benefits
Defined Benefit Plan Disclosure                            
Number of defined benefit plans                 7 1 2 2    
Percentage of pension liability paid upon retirement       20.00%                    
Settlement gain     $ 1,700,000                      
Change in Benefit Obligation                            
Benefit obligation at beginning of the year           47,892,000 44,402,000         1,057,000 1,339,000  
Service cost           1,583,000 1,310,000 1,060,000            
Interest cost           1,903,000 2,111,000 1,836,000       27,000 44,000 62,000
Plan participants' contributions           73,000 84,000         503,000 517,000  
Actuarial (gain) loss           4,108,000 2,852,000         (145,000) (206,000)  
Foreign currency exchange rate change           (1,391,000) (1,352,000)              
Gross benefits paid           (1,300,000) (1,515,000)         (643,000) (637,000)  
Curtailments and settlements           (13,772,000)                
Benefit obligation at end of year         39,096,000 39,096,000 47,892,000 44,402,000       799,000 1,057,000 1,339,000
Change in Plan Assets                            
Fair value of plan assets at beginning of year           17,156,000 15,919,000              
Actual return on plan assets           1,097,000 719,000              
Foreign currency exchange rate changes           (799,000) 48,000              
Employer contributions           2,490,000 1,901,000         140,000 120,000  
Settlements           (9,911,000)                
Plan participants' contributions           73,000 84,000         503,000 517,000  
Gross benefits paid           (1,300,000) (1,515,000)         (643,000) (637,000)  
Fair value of plan assets at end of year         8,806,000 8,806,000 17,156,000 15,919,000            
Funded status at end of year                            
Fair value of plan assets         8,806,000 8,806,000 17,156,000 15,919,000            
Benefit obligations         (39,096,000) (39,096,000) (47,892,000) (44,402,000)       (799,000) (1,057,000) (1,339,000)
Amount recognized at end of year         (30,290,000) (30,290,000) (30,736,000)         (799,000) (1,057,000)  
Estimated employer contribution in the next fiscal year         1,500,000 1,500,000           91,000    
Amounts recognized in the Consolidated Balance Sheets                            
Current liability         (644,000) (644,000) (1,183,000)         (90,000) (117,000)  
Noncurrent liability         (29,646,000) (29,646,000) (29,553,000)         (709,000) (940,000)  
Amount recognized, end of year         (30,290,000) (30,290,000) (30,736,000)         (799,000) (1,057,000)  
Accumulated other comprehensive income (loss)                            
Net actuarial loss (gain)         9,742,000 9,742,000 10,889,000         (1,816,000) (1,993,000)  
Prior service cost         32,000 32,000 137,000              
Accumulated other comprehensive income         9,774,000 9,774,000 11,026,000         (1,816,000) (1,993,000)  
Tax effect of accumulated other comprehensive income (loss) 2,100,000 2,800,000                        
Net periodic (benefit) costs                            
Net service cost           1,583,000 1,310,000 1,060,000            
Interest cost           1,903,000 2,111,000 1,836,000       27,000 44,000 62,000
Expected return on net assets           (656,000) (712,000) (677,000)            
Amortization:                            
Actuarial (gain) loss           544,000 392,000 126,000       (322,000) (323,000) (306,000)
Prior service cost           20,000 25,000 22,000            
Recurring activity           3,394,000 3,126,000 2,367,000       (295,000) (279,000) (244,000)
One time curtailment expense         2,000,000 266,000   291,000            
Net periodic benefit cost (credit)           3,660,000 3,126,000 2,658,000       (295,000) (279,000) (244,000)
Estimated amounts that will be amortized from accumulated other comprehensive income into net periodic benefit costs                            
Actuarial losses 34,000                          
Prior service costs $ 3,000