Basis of Presentation and Preparation (Details 3)	12 Months Ended
	Sep. 28, 2014 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)	21.00%
International
Concentration of Credit Risk
Revenue from customers within risk category	26.00%
U.S. commercial
Concentration of Credit Risk
Revenue from customers within risk category	29.00%
U.S. federal government
Concentration of Credit Risk
Revenue from customers within risk category	45.00%
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