Stock-Based Compensation - RSUs Outstanding (Details) - $ / shares shares in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Oct. 01, 2017	Jul. 02, 2017	Apr. 02, 2017	Dec. 31, 2016	Oct. 02, 2016	Jul. 03, 2016	Apr. 03, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
RSUs Vested
Dividends distributed on the company's Common Stock (in dollars per share)	$ 0.19	$ 0.19	$ 0.19	$ 0.18	$ 0.18	$ 0.18	$ 0.18	$ 0.17	$ 0.75	$ 0.71	$ 0.66
Class A
RSUs Vested
Dividends distributed on the company's Common Stock (in dollars per share)									0.75	0.71	0.66
Class B
RSUs Vested
Dividends distributed on the company's Common Stock (in dollars per share)									$ 0.75	$ 0.71	$ 0.66
Management Stock Purchase Plan | Restricted stock units (RSUs)
RSUs Outstanding
Number Outstanding (in shares)	174				148				174	148	101	80
Weighted Average Purchase Price (in dollars per share)	$ 39.68				$ 36.37				$ 39.68	$ 36.37	$ 36.14	$ 32.08
RSUs Vested
Number Vested (in shares)	57				28				57	28	25
Weighted Average Purchase Price (in dollars per share)	$ 36.26				$ 37.78				$ 36.26	$ 37.78	$ 33.35
$31.63-$35.41 | Management Stock Purchase Plan | Restricted stock units (RSUs)
Information about RSUs outstanding
Low end of purchase price range (in dollars per share)									31.63
High end of purchase price range (in dollars per share)									$ 35.41
RSUs Outstanding
Number Outstanding (in shares)	85								85
Weighted Average Purchase Price (in dollars per share)	$ 35.37								$ 35.37
RSUs Vested
Number Vested (in shares)	28								28
Weighted Average Purchase Price (in dollars per share)	$ 35.30								$ 35.30
$37.13-$49.92 | Management Stock Purchase Plan | Restricted stock units (RSUs)
Information about RSUs outstanding
Low end of purchase price range (in dollars per share)									37.13
High end of purchase price range (in dollars per share)									$ 49.92
RSUs Outstanding
Number Outstanding (in shares)	89								89
Weighted Average Purchase Price (in dollars per share)	$ 43.75								$ 43.75
RSUs Vested
Number Vested (in shares)	29								29
Weighted Average Purchase Price (in dollars per share)	$ 37.21								$ 37.21