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Summary Of Significant Accounting Policies - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended
	Apr. 02, 2017	Jan. 01, 2017	Dec. 31, 2016
New Accounting Pronouncements
New Accounting Pronouncement, Cumulative Effect of Change on Equity			$ 3
Length of fiscal quarters, weeks	91 days
Accounting Standards Update 2016-16
New Accounting Pronouncements
New Accounting Pronouncement, Cumulative Effect of Change on Equity		$ 3

Amount of cumulative effect of the change in accounting principle or new accounting pronouncement on retained earnings or other components of equity or net assets in the statement of financial position as of the beginning of the earliest period presented.

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