Commitments (Details Textual) (USD $)	3 Months Ended		9 Months Ended
	Dec. 29, 2012	Dec. 31, 2011	Dec. 29, 2012	Dec. 31, 2011
Commitments (Textual) [Abstract]
Aggregate future rental income to be received	$ 4,100,000		$ 4,100,000
Rent expense, net of rental income	904,000	598,000	3,000,000	2,200,000
Other commitments	109,800,000		109,800,000
Non-cancelable license obligations	16,100,000		16,100,000
Maximum future commitment to acquire licenses to intellectual property until July 2023	$ 5,000,000