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Basis of Presentation and Preparation (Details 3)
12 Months Ended
Sep. 29, 2013
item
Concentration of Credit Risk  
Financial institutions, in any such number of which investment exposure is limited 1
Accounts receivable due from various agencies of the U.S. federal government (as a percent) 22.00%
International
 
Concentration of Credit Risk  
Revenue from customers within risk category 27.00%
U.S. commercial
 
Concentration of Credit Risk  
Revenue from customers within risk category 26.00%
U.S. federal government
 
Concentration of Credit Risk  
Revenue from customers within risk category 47.00%
Minimum
 
Concentration of Credit Risk  
Period for contingent earn-out payments 2 years
Maximum
 
Concentration of Credit Risk  
Period for contingent earn-out payments 3 years