Condensed Consolidated Balance Sheets (Unaudited) (Parenthetical) (USD $) In Thousands, except Per Share data, unless otherwise specified	Jun. 29, 2012	Mar. 30, 2012
Current assets:
Accounts receivable, allowances	263	212
Stockholders' equity:
Preferred stock, par value (in dollars per share)	0.01	0.01
Preferred stock, authorized (in shares)	5,000	5,000
Preferred stock outstanding (in shares)	0	0
Common stock, par value (in dollars per share)	0.01	0.01
Common stock, authorized (in shares)	75,000	75,000
Common stock, outstanding (in shares)	30,587	30,550
Convertible senior notes [Member]
Long-term liabilities:
Interest rate of long-term debt (in hundredths)	3.75%	3.75%
Redeemable convertible subordinated debentures [Member]
Long-term liabilities:
Interest rate of long-term debt (in hundredths)	7.25%	7.25%