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Contingencies (Tables)
 6 Months Ended
Sep. 29, 2013
Loss Contingency [Abstract]  
Summary of the amounts recorded for environmental remediation
The following is a summary of the amounts recorded for environmental remediation:
 
 
September 29, 2013
 
March 31, 2013
 
 
Liability
 
Receivable
 
Liability
 
Receivable
Amounts (payable) receivable
 
$
(58,379
)
 
$
34,004

 
$
(61,227
)
 
$
35,638

Unamortized discount
 
5,961

 
(3,123
)
 
3,731

 
(1,925
)
Present value amounts (payable) receivable
 
$
(52,418
)
 
$
30,881

 
$
(57,496
)
 
$
33,713