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Earnings Per Share (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Sep. 28, 2013	Sep. 29, 2012	Sep. 28, 2013	Sep. 29, 2012
Numerator For Earnings Per Share Calculation [Abstract]
Net income	$ 13,650	$ 11,548	$ 27,221	$ 23,185
Preferred stock dividends	(83)	(76)	(167)	(152)
Income available to common shareholders	$ 13,567	$ 11,472	$ 27,054	$ 23,033
Denominator for earnings per common share calculation:
Weighted average common shares, basic	31,390,000	31,023,000	31,346,000	30,973,000
Effect of dilutive securities:
Preferred stock	760,000	760,000	760,000	760,000
Stock options	403,000	423,000	417,000	482,000
Weighted average number of common shares, diluted	32,553,000	32,206,000	32,523,000	32,215,000
Basic Earnings per common share:	$ 0.43	$ 0.37	$ 0.86	$ 0.74
Diluted Earnings per common share:	$ 0.42	$ 0.36	$ 0.84	$ 0.72
Antidilutive securities excluded from computation of earnings per share	95,000	648,000	149,000	648,000

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