Business Segments (Details) - USD ($) $ in Millions	12 Months Ended
	Jul. 03, 2015	Jun. 27, 2014	Jun. 28, 2013
Selected information by business segment and geographical area
Total assets	$ 13,129.0	$ 4,919.0	$ 4,845.0
Capital Expenditures	148.0	209.0	165.0
Depreciation and Amortization	244.0	204.0	221.0
US Operations [Member]
Selected information by business segment and geographical area
Revenue	4,659.0	4,590.0	4,692.0
Long-lived assets	1,099.0	648.0	574.0
International Operations [Member]
Selected information by business segment and geographical area
Revenue	424.0	422.0	420.0
Long-lived assets		80.0	79.0
R F Communications [Member]
Selected information by business segment and geographical area
Total assets	1,322.0	1,254.0	1,337.0
Capital Expenditures	26.0	42.0	31.0
Depreciation and Amortization	64.0	61.0	72.0
Government Communications Systems [Member]
Selected information by business segment and geographical area
Total assets	1,010.0	975.0	991.0
Capital Expenditures	78.0	102.0	56.0
Depreciation and Amortization	46.0	42.0	42.0
Integrated Network Solutions [Member]
Selected information by business segment and geographical area
Total assets	1,508.0	1,747.0	1,748.0
Capital Expenditures	39.0	60.0	71.0
Depreciation and Amortization	91.0	94.0	99.0
Integrated Network Solutions [Member] | International Operations [Member]
Selected information by business segment and geographical area
Long-lived assets	66.0
Exelis [Member]
Selected information by business segment and geographical area
Total assets	7,979.0	0.0	0.0
Capital Expenditures	4.0	0.0	0.0
Depreciation and Amortization	15.0	0.0	0.0
Corporate [Member]
Selected information by business segment and geographical area
Total assets	1,310.0	943.0	742.0
Capital Expenditures	1.0	5.0	4.0
Depreciation and Amortization	28.0	7.0	8.0
Segment, Discontinued Operations [Member]
Selected information by business segment and geographical area
Total assets	0.0	0.0	27.0
Capital Expenditures	0.0	0.0	3.0
Depreciation and Amortization	$ 0.0	$ 0.0	$ 0.0