Description of Business and Summary of Significant Accounting Policies (Details) (USD $)	3 Months Ended
	Jun. 29, 2012	Mar. 30, 2012	Jun. 29, 2012 7 1/4% Convertible Subordinated Debentures [Member]	Mar. 30, 2012 7 1/4% Convertible Subordinated Debentures [Member]	Jun. 24, 2011 7 1/4% Convertible Subordinated Debentures [Member]	Jun. 29, 2012 3.75% Convertible Senior Notes [Member]	Mar. 30, 2012 3.75% Convertible Senior Notes [Member]	Jun. 24, 2011 3.75% Convertible Senior Notes [Member]
Merger Agreement with Sonus Networks, Inc.:
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Cash value of stock (in dollars per share)	$ 1.35
Debt Instrument [Line Items]
Interest rate of long-term debt (in hundredths)			7.25%	7.25%	7.25%	3.75%	3.75%	3.75%
Loss on Contract Termination	$ 1,250,000
Significant Accounting Policies:
Number of weeks in most of the fiscal years (in weeks)	52
Number of weeks per quarter (in weeks)	13
Number of weeks in fiscal year 2012 (in weeks)	53