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Restructuring And Impairment Costs (Tables)
9 Months Ended
Dec. 31, 2011
Restructuring And Impairment Costs [Abstract]  
Cumulative Restructuring And Impairment Costs
(in thousands of dollars)   Closure of
Processing
Facility
in Canada
    Other
Restructuring
and Cost
Reduction
Initiatives
    Total  
                 
Restructuring Costs:                        
Employee termination benefits   $ 2,412     $ 15,866     $ 18,278  
Pension curtailment and settlement costs     4,081             4,081  
Other costs           3,733       3,733  
      6,493       19,599       26,092  
                         
Impairment Costs:                        
Property, plant and equipment     5,632             5,632  
                         
Total restructuring and impairment costs   $ 12,125     $ 19,599     $ 31,724  
Reconciliation Of Company's Liability For The Restructuring Costs
(in thousands of dollars)   Employee
Termination
Benefits
    Other Costs     Total  
                 
Fiscal Year 2011 activity:                        
Costs charged to expense   $ 11,155     $ 636     $ 11,791  
Payments     (4,769 )     (411 )     (5,180 )
Balance at March 31, 2011     6,386       225       6,611  
                         
Fiscal Year 2012 activity through December 31, 2011:                        
Costs charged to expense     7,123       3,097       10,220  
Payments     (12,017 )     (2,994 )     (15,011 )
Balance at December 31, 2011   $ 1,492     $ 328     $ 1,820