Stock-Based Compensation (Stock Option Activity Under The Principal Option Plans) (Details) - Stock Options And Awards - USD ($) $ / shares in Units, $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 27, 2015	Dec. 28, 2014
Number of Options Outstanding (in shares)
Number of shares, outstanding at beginning of period (shares)	2,349,447
Number of shares, granted (shares)	266,080
Number of shares, exercised (shares)	(15,430)
Number of shares, forfeited or expired (shares)	(436,542)
Number of shares, outstanding at end of period (shares)	2,163,555	2,349,447
Number of shares, vested and expected to vest (shares)	2,145,409
Number of shares, exercisable (shares)	1,748,868
Weighted average exercise price
Weighted-average exercise price, outstanding at beginning of period (USD per share)	$ 17.77
Weighted-average exercise price, granted (USD per share)	13.40
Weighted-average exercise price, exercised (USD per share)	8.98
Weighted-average exercise price, forfeited or expired (USD per share)	18.76
Weighted-average exercise price, outstanding at end of period (USD per share)	17.10	$ 17.77
Weighted-average exercise price, vested and expected to vest (USD per share)	17.12
Weighted-average exercise price, exercisable (USD per share)	$ 17.89
Additional Disclosures [Abstract]
Weighted-average remaining contractual term, outstanding at beginning of period in years	4 years 6 months 4 days	3 years 11 months 23 days
Weighted-average remaining contractual term, vested and expected to vest in years	4 years 5 months 18 days
Weighted-average remaining contractual term, exercisable	3 years 5 months 11 days
Aggregate intrinsic value, outstanding at beginning of period	$ 2,716
Aggregate intrinsic value, outstanding at end of period	0	$ 2,716
Aggregate intrinsic value, vested and expected to vest	0
Aggregate intrinsic value, exercisable	$ 0