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Net Income per Share - Share Repurchase Programs (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jul. 01, 2017	Jun. 30, 2018	Jul. 01, 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	215,585	389,079	378,477	389,079
Average repurchase price per share (in dollars per share)	$ 55.99	$ 34.63	$ 53.90	$ 34.63
Amount available for future repurchases	$ 9.1		$ 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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(28))
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-Name Accounting Standards Codification
-Topic 505
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Total cost of shares repurchased divided by the total number of shares repurchased.

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-Topic 505
-SubTopic 30
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