Commitments (Details Textual) (USD $)	3 Months Ended		6 Months Ended
	Sep. 28, 2013	Sep. 29, 2012	Sep. 28, 2013	Sep. 29, 2012
Commitments (Textual) [Abstract]
Aggregate future rental income to be received	$ 6,100,000		$ 6,100,000
Rent expense, net of rental income	725,000	1,300,000	1,500,000	2,100,000
Other commitments	105,700,000		105,700,000
Non-cancelable license obligations	16,600,000		16,600,000
Maximum future commitment to acquire licenses to intellectual property until July 2023	$ 5,000,000