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Accounts Receivable (Tables)
 12 Months Ended
Jan. 03, 2016
Receivables [Abstract]  
Accounts Receivable

 Accounts receivable (in millions):
  
Balance at year-end
 
  
2015
 
2014
Commercial and other receivables
  
$
325.5

 
$
357.5

U.S. Government and prime contractors contract receivables:
  
 
 
 
Billed receivables
  
19.9

 
17.3

Unbilled receivables
  
33.9

 
33.7

 
  
379.3

 
408.5

Reserve for doubtful accounts
  
(6.3
)
 
(7.8
)
Total accounts receivable, net
  
$
373.0

 
$
400.7