Earnings Per Share (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Sep. 29, 2012	Sep. 24, 2011	Sep. 29, 2012	Sep. 24, 2011
Numerator For Earnings Per Share Calculation [Abstract]
Net income	$ 11,548	$ 15,117	$ 23,185	$ 30,559
Preferred stock dividends	(76)	(68)	(152)	(129)
Income available to common shareholders	$ 11,472	$ 15,049	$ 23,033	$ 30,430
Denominator for earnings per common share calculation:
Weighted average common shares, basic	31,023,000	30,656,000	30,973,000	30,576,000
Effect of dilutive securities:
Preferred stock	760,000	760,000	760,000	760,000
Stock options	423,000	857,000	482,000	965,000
Weighted average number of common shares, diluted	32,206,000	32,273,000	32,215,000	32,301,000
Basic Earnings per common share:	$ 0.37	$ 0.49	$ 0.74	$ 1.00
Diluted Earnings per common share:	$ 0.36	$ 0.47	$ 0.72	$ 0.95
Antidilutive securities excluded from computation of earnings per share	648,000	686,000	648,000	687,000