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Long-Term Debt (Details Textuals2) - USD ($) $ in Millions	12 Months Ended
Long-Term Debt (Details Textuals2) - USD ($) $ in Millions	Jul. 03, 2015	Feb. 29, 2016	Apr. 27, 2015	Jun. 27, 2014
Debt Instrument [Line Items]
Premium on notes	$ 51.0
Fair value of notes	5,230.0			$ 1,799.6
Exelis [Member]
Debt Instrument [Line Items]
Percent of Exelis owned by Harris Corporation			100.00%
Fair value of notes	$ 702.0
Variable rate term loan agreement
Debt Instrument [Line Items]
Interest rate term	At our election, borrowings under the Term Loan Agreement will bear interest either at (i) the eurodollar rate plus an applicable margin, or (ii) the base rate plus an applicable margin. The eurodollar rate for an interest period is the rate per annum equal to (a) LIBOR for such interest period, divided by (b) a percentage equal to 1.00 minus the daily average eurodollar reserve rate for such interest period. For both tranches of term loans, the applicable interest rate margin over the eurodollar rate may range from a minimum of 1.125% to a maximum of 2.00% based on our Senior Debt Ratings. The base rate is a fluctuating rate per annum equal to the highest of (i) the federal funds rate plus 0.50%, (ii) the prime lending rate published in The Wall Street Journal, and (iii) the eurodollar rate determined on a daily basis for a one-month interest period plus 100 basis points.
Debt instrument, restrictive covenants	The Term Loan Agreement also requires that certain of our subsidiaries that incur, borrow or guarantee debt in a principal amount exceeding $100 million become guarantors under the Term Loan Agreement. The Term Loan Agreement also contains certain negative covenants, including covenants: limiting certain liens on assets; limiting certain mergers, consolidations or sales of assets; limiting certain sale and leaseback transactions; limiting certain vendor financing investments; and limiting certain investments in unrestricted subsidiaries. The Term Loan Agreement also requires that we not permit at any time our ratio of consolidated total indebtedness to total capital, each as defined in the Term Loan Agreement, to be greater than (x) 0.675:1.00 between May 29, 2015 and February 29, 2016 and (y) 0.65:1.00 thereafter. payment default by us or certain of our subsidiaries under other indebtedness with a principal amount in excess of $100 million or acceleration of or ability to accelerate such other indebtedness; occurrence of one or more final judgments or orders for the payment by us of money in excess of $100 million that remain unsatisfied; incurrence by us or certain of our subsidiaries of certain ERISA liabilities in excess of $100 million;
Variable rate term loan agreement \| Exelis [Member]
Debt Instrument [Line Items]
Long-term debt, gross		$ 1,300.0
Variable rate term loan agreement \| Eurodollar [Member] \| Maximum [Member]
Debt Instrument [Line Items]
Interest rate margin	2.00%
Variable rate term loan agreement \| Eurodollar [Member] \| Minimum [Member]
Debt Instrument [Line Items]
Interest rate margin	1.125%
Variable rate term loan agreement \| Base Rate [Member] \| Maximum [Member]
Debt Instrument [Line Items]
Interest rate margin	1.00%
Variable rate term loan agreement \| Base Rate [Member] \| Minimum [Member]
Debt Instrument [Line Items]
Interest rate margin	0.125%
The two tranches of variable-rate term loans
Debt Instrument [Line Items]
Debt issuance costs	$ 6.0
3-year tranche, due May 29, 2018
Debt Instrument [Line Items]
Long-term debt, gross		650.0
5-year tranche, due May 29, 2020
Debt Instrument [Line Items]
Long-term debt, gross		$ 650.0
Fixed rate debt securities
Debt Instrument [Line Items]
Notes Payable	2,400.0
Fixed rate debt securities \| Financial guarantee by Exelis Inc.
Debt Instrument [Line Items]
Notes Payable	3,226.0
Exelis Notes [Member]
Debt Instrument [Line Items]
Premium on notes	$ 52.0
New Notes [Member]
Debt Instrument [Line Items]
New notes price as a percent of aggregate principal amount	100.00%
New Notes [Member] \| External Credit Rating, Investment Grade [Member]
Debt Instrument [Line Items]
New notes price as a percent of aggregate principal amount	101.00%
New Notes [Member] \| Interest Income [Member]
Debt Instrument [Line Items]
Debt issuance costs	$ 23.0
5.95% notes, due December 1, 2017 \| Exelis [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	5.95%
6.375% notes, due June 15, 2019 \| Exelis [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	6.375%