Stock-Based Compensation (Schedule of Stock Option Activity) (Detail) (USD $) In Millions, except Per Share data, unless otherwise specified	8 Months Ended	12 Months Ended		1 Months Ended		8 Months Ended
	Sep. 27, 2013	Jan. 31, 2013	Sep. 27, 2013 SAIC Separation Adjustment	Nov. 01, 2013 Stock Split		Sep. 27, 2013 Stock Split
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock conversion upon divestiture			1.4523
Stock-Based Compensation [Abstract]
Shares of stock under stock options, Outstanding, beginning balance	4.9			4.9	[1]
Shares of stock under stock options, Options granted	1.4			0.1
Shares of stock under stock options, Special dividend adjustments	0.4
Shares of stock under stock options, Options forfeited or expired	(1.3)			(0.1)
Shares of stock under stock options, Separation Adjustment	(1.9)
Shares of stock under stock options, Outstanding, ending balance	3.5	4.9		4.9		4.9	[1]
Shares of stock under stock options, Outstanding, Exercisable	1.5			2.0
Weighted average exercise price, Outstanding, beginning balance	$ 67.24			$ 40.20	[1]
Weighted average exercise price, Options granted	$ 54.86			$ 46.19
Weighted average exercise price, Options forfeited or expired	$ 71.80			$ 42.84
Weighted average exercise price, Separation Adjustment	$ 57.85
Weighted average exercise price, Outstanding, ending balance	$ 59.25	$ 67.24		$ 40.31		$ 40.20	[1]
Weighted average exercise price, Exercisable at end of the period	$ 64.17			$ 44.30
Weighted average remaining contractual term, Outstanding	3 years 10 months 24 days	3 years		4 years		3 years 10 months 24 days
Weighted average remaining contractual term, Exercisable end of the period	2 years			2 years
Aggregate intrinsic value, Outstanding, beginning balance	$ 0			$ 24.0
Aggregate intrinsic value, Outstanding, ending balance	24.0	0		35.0		24.0
Aggregate intrinsic value, Exercisable end of the period	$ 4.0			$ 6.0

[1] Adjusted for Conversion Ratio of