Stock-Based Compensation (Narrative) (Details) (USD $)	3 Months Ended		9 Months Ended			0 Months Ended					9 Months Ended
	Dec. 29, 2012	Dec. 31, 2011	Dec. 29, 2012	Dec. 31, 2011	Mar. 31, 2012	Aug. 17, 2001 2001 Stock Option Plan [Member]	Aug. 17, 2007 2001 Stock Option Plan [Member] Expiration From Grant Date [Member]	Aug. 17, 2001 2001 Stock Option Plan [Member] Expiration From Grant Date [Member]	Aug. 17, 2007 2001 Stock Option Plan [Member] Expiration From Termination Of Service [Member]	Aug. 17, 2001 2001 Stock Option Plan [Member] Expiration From Termination Of Service [Member]	Dec. 29, 2012 2009 Equity Incentive Plan [Member]	Aug. 14, 2009 2009 Equity Incentive Plan [Member]	Aug. 14, 2009 2009 Equity Incentive Plan [Member] Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation	$ 648,000	$ 821,000	$ 2,162,000	$ 2,243,000
Options granted, estimated total grant date fair value	57,000	348,000	295,000	2,924,000
Unrecorded stock-based compensation related to stock options	3,752,000		3,752,000
Unrecognized stock-based compensation amortization period			1 year 8 months 16 days
Shares reserved for issuance						2,000,000						1,000,000	1,599,909
Options exercisable period						1 year
Expriation period							10 years	7 years	30 days	30 days	10 years
Vesting period						5 years					5 years
Number of shares available for grant	687,151		687,151		677,429							159,509
Prior forfeited shares available for grant												1,440,400
Percentage of options to vest on each of the first five anniversaries			20.00%
Weighted average fair value	$ 6.67	$ 6.70	$ 6.97	$ 7.89
Intrinsic value	0		26,000
Proceeds from stock options exercised	0		249,000
Intrinsic value of options outstanding	0		0
Percentage of salary allowable to purchase shares for ESPP	20.00%		20.00%
Purchase price percentage for ESPP	95.00%		95.00%
Shares allowable for purchase during offering period of ESPP	500		500
Proceeds from ESPP	$ 50,000	$ 70,000	$ 113,000	$ 159,000