Stock Repurchases (Details) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended	6 Months Ended
	Jul. 16, 2016 USD ($) $ / shares shares	Jul. 16, 2016 USD ($) $ / shares shares
Class of Stock [Line Items]
Treasury Stock, Value, Acquired, Cost Method		$ 12,179
Stock Repurchase Plan (current year shares) [Member]
Class of Stock [Line Items]
Stock Repurchase Program, Authorized Amount	$ 500,000	$ 500,000
Treasury Stock, Shares, Acquired | shares	0	0
Stock Repurchase Program, Remaining Authorized Repurchase Amount	$ 415,092	$ 415,092
Net Settlement of Shares Issued as a Result of the Vesting of Restricted Stock [Member]
Class of Stock [Line Items]
Treasury Stock, Shares, Acquired | shares	2	80
Treasury Stock, Value, Acquired, Cost Method	$ 367	$ 12,179
Treasury Stock Acquired, Average Cost Per Share | $ / shares	$ 155.09	$ 152.59