Share-Based Compensation (Details 6) (USD $) In Millions, except Share data, unless otherwise specified	12 Months Ended
	Dec. 28, 2013	Dec. 29, 2012	Dec. 31, 2011
1998 Employee Stock Purchase Plan
Additional disclosures
Number of shares authorized	243,000
Purchase price as a percentage of fair market value	85.00%
Offering period	1 year
Shares issued	0	0	0
Options
Additional disclosures
Fair value of options vested	$ 1.3	$ 1.5	$ 1.1
Unrecognized compensation cost, net of expected forfeitures	3.0
Weighted-average period over which cost is expected to be recognized	2 years 10 months 24 days
Additional disclosures
Vested shares outstanding that include the right of first refusal provision	175,277
Options exercisable that include the right of first refusal provision (in shares)	236,062
Restricted stock and stock units
Additional disclosures
Number of vesting installments	4
Unrecognized compensation cost, net of expected forfeitures	$ 4.7
Weighted-average period over which cost is expected to be recognized	2 years 9 months 18 days
Non-vested Restricted Stock and Stock Units, Number of Shares
Balance at the beginning of the period (in shares)	299,133
Granted (in shares)	155,403
Vested (in shares)	(134,384)	(216,528)	(164,086)
Forfeited (in shares)	(11,114)
Balance at the end of the period (in shares)	309,038	299,133
Non-vested Restricted Stock and Stock Units, Weighted-Average Fair Value
Balance at the beginning of the period (in dollars per share)	$ 22.49
Granted (in dollars per share)	$ 18.50
Vested (in dollars per share)	$ 22.73
Forfeited (in dollars per share)	$ 22.14
Balance at the end of the period (in dollars per share)	$ 20.39	$ 22.49
Additional disclosures
Number of shares issuable upon achievement of certain financial performance goals, specified period one	219,000