Impairment Loss on Investments (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended	12 Months Ended
Apr. 02, 2011	Mar. 31, 2012	Apr. 02, 2011	Apr. 03, 2010
Impairment Loss on Investments (Textual) [Abstract]
Impairment loss on investments	$ 5,900	$ 0	$ 5,904	$ 3,805

The amount by which the fair value of an investment is less than the amortized cost basis or carrying amount of that investment at the balance sheet date and the decline in fair value is deemed to be other than temporary, before considering whether or not such amount is recognized in earnings or other comprehensive income.

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