Stockholder's Equity (Narrative) (Details) $ / shares in Units, $ in Thousands			1 Months Ended			2 Months Ended	12 Months Ended
	Feb. 19, 2016 shares	Jun. 03, 2015 shares	Nov. 30, 2015 USD ($) shares	Feb. 28, 2015 USD ($) shares	Sep. 30, 2014 USD ($) shares	Feb. 29, 2016 installment shares	Jan. 03, 2016 USD ($) shares	Dec. 28, 2014 USD ($) $ / shares shares	Dec. 29, 2013 USD ($) $ / shares shares	Dec. 30, 2012 $ / shares shares	Jan. 26, 2016 shares	Feb. 02, 2015 USD ($) shares	Jan. 27, 2015 shares	Feb. 29, 2012 installment shares	Oct. 31, 2011 shares	Jan. 31, 2009 installment shares
Treasury Stock
Treasury shares repurchased (shares)							2,561,815	1,396,290		0
Purchase of treasury stock | $							$ 243,800	$ 146,600	$ 0
Treasury stock (shares)							3,183,266	1,042,281	0	0
Preferred Stock
Preferred stock issued							0	0	0
Preferred stock, shares outstanding							0	0	0
Stock Incentive Plan
Stock options maximum life							10 years
Stock options granted in period							0
Period used for the exchange traded option included the longest dated options							3 months
Grant date fair value of stock options granted (in USD per share) | $ / shares								$ 36.19	$ 27.17
Non-Employee Director Stock Compensation Plan
Pretax intrinsic value of options exercised | $							$ 19,300	$ 23,200
Intrinsic value of options outstanding | $							59,500
Intrinsic value of options exercisable | $							59,300
Amount of cash received from exercise of stock options | $							$ 19,000	18,300
Stock options
Stock Incentive Plan
Stock options proportion exercisable on first, second and third year							0.3333
Vesting period over which employee stock option grants are evenly expensed							3 years
Share-based compensation expense | $							$ 12,200	14,000	$ 10,700
Non-Employee Director Stock Compensation Plan
Unrecognized compensation cost related to non-vested awards | $							$ 9,100
Weighted average period for non-vested awards expected to be recognized							11 months
Non-employee stock option
Stock Incentive Plan
Stock options maximum life							10 years
Non-Employee Director Stock Compensation Plan
Period after issuance until stock options exercisable							1 year
Performance shares
Stock Incentive Plan
Share-based compensation expense | $							$ 2,300	$ 6,200	$ 3,200
Performance Share Plan
Performance period for judging awards							3 years
Share based compensation arrangement by share based payment award, shares expected to be issued in three equal installments				48,794										22,981		109,557
Share based compensation arrangement by share based payment award, shares expected to be issued in three equal installments, net of forfeitures							7,921
Number of equal annual installments | installment														3		3
Market price of issued shares | $ / shares										$ 55.58
Number of shares issued							1,944	19,742	23,519	36,531
Share-based compensation arrangement by share-based payment award, equity instruments other than options, authorized units remaining to be issued							1,883
Restricted stock
Stock Incentive Plan
Share-based compensation expense | $							$ 4,000	$ 2,800	$ 2,100
Non-Employee Director Stock Compensation Plan
Unrecognized compensation cost related to non-vested awards | $							$ 3,600
Weighted average period for non-vested awards expected to be recognized							1 year 7 months 15 days
Granted							43,588	37,688	48,325
Restricted Stock Award Program
Shares of restricted stock issued and outstanding							109,170
2011 Stock Repurchase Program
Treasury Stock
Treasury shares repurchased (shares)								469,290
Purchase of treasury stock | $								$ 45,000
September 2014 Accelerated Share Repurchase Program
Treasury Stock
Number of shares authorized to be repurchased					1,030,000
Treasury shares repurchased (shares)		78,522			927,000
Purchase of treasury stock | $					$ 91,400
Stock repurchase program, authorized amount | $					$ 101,600
Percentage of shares repurchased					90.00%
January 2015 Accelerated Share Repurchase Program
Treasury Stock
Number of shares authorized to be repurchased													2,500,000
Purchase of treasury stock | $			$ 1,200
November 2015 Accelerated Share Repurchase Program
Treasury Stock
Number of shares authorized to be repurchased			1,100,000
Treasury shares repurchased (shares)			1,045,000
Purchase of treasury stock | $			$ 95,500
Stock repurchase program, authorized amount | $			$ 100,500
Percentage of shares repurchased			95.00%
February 2015 Accelerated Share Repurchase Program
Treasury Stock
Number of shares authorized to be repurchased												1,500,000
Treasury shares repurchased (shares)				1,425,000
Purchase of treasury stock | $				$ 134,900
Stock repurchase program, authorized amount | $				$ 142,000								$ 142,000
Percentage of shares repurchased				95.00%
Common Stock
Treasury Stock
Number of shares authorized to be repurchased															2,500,000
Subsequent Event | Performance shares
Performance Share Plan
Number of equal annual installments | installment						3
Number of shares issued						864
Subsequent Event | November 2015 Accelerated Share Repurchase Program
Treasury Stock
Treasury shares repurchased (shares)	135,374
Subsequent Event | Accelerated Share Repurchase Program
Treasury Stock
Number of shares authorized to be repurchased											3,000,000
Non-Employee Director | Restricted Stock Units (RSUs)
Non-Employee Director Stock Compensation Plan
Share-based compensation arrangement by share based payment award equity instruments other than options granted in period, total fair value | $							$ 110
Granted							9,534
First Time Director Appointed After Annual Meeting | Restricted Stock Units (RSUs)
Non-Employee Director Stock Compensation Plan
Share-based compensation arrangement by share based payment award equity instruments other than options granted in period, total fair value | $							$ 55
Maximum | Performance shares
Performance Share Plan
Share based compensation arrangement by share based payment award, shares expected to be issued in three equal installments				97,588