Commitments (Details Textual) (USD $)	3 Months Ended
	Jun. 29, 2013	Jun. 30, 2012
Commitments (Textual) [Abstract]
Aggregate future rental income to be received	$ 2,700,000
Rent expense, net of rental income	766,000	866,000
Other commitments	104,400,000
Non-cancelable license obligations	9,700,000
Maximum future commitment to acquire licenses to intellectual property until July 2023	$ 5,000,000