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Net Income per Share - Share Repurchase Programs (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended	9 Months Ended
	Sep. 30, 2017	Sep. 29, 2018	Sep. 30, 2017	Feb. 15, 2018	May 03, 2017
Share Repurchase Program
Share repurchase program, amount authorized to be repurchased				$ 20.0	$ 20.0
Number of shares repurchased and retired	165,629	378,477	554,708
Average repurchase price per share (in dollars per share)	$ 36.63	$ 53.90	$ 35.23
Amount available for future repurchases		$ 9.1

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Amount of stock repurchase plan authorized.

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Amount remaining of a stock repurchase plan authorized.

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Number of shares that have been repurchased and retired during the period.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
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-Subparagraph (SX 210.5-02(28))
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Total cost of shares repurchased divided by the total number of shares repurchased.

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