Shareholders' Equity (Other than Options) (Details) - $ / shares	12 Months Ended
	Dec. 30, 2017	Dec. 31, 2016	Jan. 02, 2016
Restricted Stock
Shares
Unvested Shares, Beginning Balance (in shares)	19,593
Granted, Shares (in shares)	13,941
Vested, Shares (in shares)	(19,593)
Unvested Shares, Ending Balance (in shares)	13,941	19,593
Weighted Average Fair Value at Grant Date
Beginning Balance (in dollars per share)	$ 57.43
Granted (in dollars per share)	80.70	$ 57.43	$ 78.15
Vested (in dollars per share)	57.43
Ending Balance (in dollars per share)	$ 80.70	$ 57.43
Weighted Average Remaining Contractual Term	4 months 18 days	4 months 18 days
Restricted Stock Units (RSUs)
Shares
Unvested Shares, Beginning Balance (in shares)	277,863
Granted, Shares (in shares)	76,030
Vested, Shares (in shares)	(85,790)
Forfeited, Shares (in shares)	(7,570)
Unvested Shares, Ending Balance (in shares)	260,533	277,863
Weighted Average Fair Value at Grant Date
Beginning Balance (in dollars per share)	$ 69.23
Granted (in dollars per share)	80.48	$ 57.50	77.38
Vested (in dollars per share)	74.50
Forfeited (in dollars per share)	68.02
Ending Balance (in dollars per share)	$ 70.81	$ 69.23
Weighted Average Remaining Contractual Term	1 year 8 months	1 year 8 months 24 days
Performance Share Units
Shares
Unvested Shares, Beginning Balance (in shares)	133,340
Granted, Shares (in shares)	48,666
Vested, Shares (in shares)	(110)
Forfeited, Shares (in shares)	(26,780)
Unvested Shares, Ending Balance (in shares)	155,116	133,340
Weighted Average Fair Value at Grant Date
Beginning Balance (in dollars per share)	$ 65.28
Granted (in dollars per share)	90.82	$ 51.84	$ 89.98
Vested (in dollars per share)	83.74
Forfeited (in dollars per share)	81.76
Ending Balance (in dollars per share)	$ 70.43	$ 65.28
Weighted Average Remaining Contractual Term	1 year 11 months 23 days	1 year 11 months 23 days