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Accounts Receivable (Tables)
 12 Months Ended
Dec. 30, 2012
Receivables [Abstract]  
Accounts Receivable
Accounts receivable are summarized as follows (in millions):
 
  
Balance at year-end
 
  
2012
 
2011
U.S. Government and prime contractors contract receivables:
  
 
 
 
Billed receivables
  
$
26.0

  
$
24.0

Unbilled receivables
  
28.2

  
26.9

Commercial and other receivables
  
300.9

  
222.9

 
  
355.1

  
273.8

Reserve for doubtful accounts
  
(4.8
)
 
(3.8
)
Total accounts receivable, net
  
$
350.3

  
$
270.0