Commitments (Details Textual) (USD $)	3 Months Ended		9 Months Ended
	Dec. 31, 2011	Jan. 01, 2011	Dec. 31, 2011	Jan. 01, 2011
Commitments (Textual) [Abstract]
Aggregate future rental income to be received	$ 8,100,000		$ 8,100,000
Rent expense, net of rental income	598,000	1,200,000	2,200,000	3,600,000
Other commitments	86,200,000		86,200,000
Non-cancelable license obligations	29,800,000		29,800,000
Maximum future commitment to acquire licenses to intellectual property until July 2023	$ 5,000,000		$ 5,000,000