Commitments and Contingencies (Details) (USD $)	12 Months Ended
	Mar. 31, 2013 sqft	Apr. 01, 2012	Mar. 27, 2011 sqft	Mar. 30, 2008	Apr. 01, 2007
Operating Leased Assets [Line Items]
Rent expense	$ 2,907,900	$ 2,661,400	$ 2,789,100
Lease extension period				5 years	6 months
Increase in leased rental area	4,800		3,800
Total space rented (in sq ft)	102,200
Minimum Future Obligations [Abstract]
2014	2,811,900
2015	2,338,200
2016	2,191,100
2017	2,255,700
2018	1,787,100
Thereafter	118,500
Total	11,502,500
Minimum [Member]
Operating Leased Assets [Line Items]
Base rental rate per month	153,300
Maximum [Member]
Operating Leased Assets [Line Items]
Base rental rate per month	177,700
Hunt Valley, Maryland [Member]
Operating Leased Assets [Line Items]
Lease extension period			3 years
Total space rented (in sq ft)				66,000
Hunt Valley, Maryland [Member] | Minimum [Member]
Operating Leased Assets [Line Items]
Base rental rate per month			27,500
Hunt Valley, Maryland [Member] | Maximum [Member]
Operating Leased Assets [Line Items]
Base rental rate per month			33,000
San Antonio, Texas [Member]
Operating Leased Assets [Line Items]
Total space rented (in sq ft)	13,100
San Antonio, Texas [Member] | Minimum [Member]
Operating Leased Assets [Line Items]
Base rental rate per month	14,700
San Antonio, Texas [Member] | Maximum [Member]
Operating Leased Assets [Line Items]
Base rental rate per month	$ 16,900