Stock-Based Compensation (Narrative) (Details) (USD $)	3 Months Ended										3 Months Ended
	Jun. 30, 2012	Jul. 02, 2011	Mar. 31, 2012	Aug. 17, 2001	Aug. 17, 2001 Expiration From Grant Date [Member]	Aug. 17, 2001 Expiration From Termination Of Service [Member]	Aug. 14, 2009 2001 Stock Option Plan [Member]	Aug. 17, 2001 2001 Stock Option Plan [Member]	Aug. 17, 2007 2001 Stock Option Plan [Member] Expiration From Grant Date [Member]	Aug. 17, 2007 2001 Stock Option Plan [Member] Expiration From Termination Of Service [Member]	Jun. 30, 2012 Two Thousand Nine Equity Incentive Plan [Member]	Aug. 14, 2009 Two Thousand Nine Equity Incentive Plan [Member]	Aug. 14, 2009 Two Thousand Nine Equity Incentive Plan [Member] Maximum [Member]
Stock-based compensation	$ 745,000	$ 593,000
Estimated total grant date fair value		931,000
Unrecorded stock-based compensation	4,826,000
Unrecognized stock-based compensation amortization period	1 year 9 months 18 days
Shares reserved for issuance								2,000,000				1,000,000	1,599,909
Expriation period				5 years	7 years	30 days			10 years	30 days	10 years
Vesting period											5 years
Number of shares available for grant	704,229		677,429				159,509
Prior forfeited shares available for grant												1,440,400
Weighted average fair value		$ 8.10
Intrinsic value	26,000
Proceeds from stock options exercised	249,000
Percentage of salary allowable to purchase shares for ESPP	20.00%
Purchase price percentage for ESPP	95.00%
Shares allowable for purchase during offering period of ESPP	500
Proceeds from ESPP	$ 63,000	$ 89,000