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Marketable Securities (Narrative) (Details) (USD $)	Mar. 30, 2013 security	Mar. 31, 2012 security
Marketable Securities [Abstract]
Minimum maturity period of investments to be classified as available-for-sale securities	90 days
Gross unrealized losses	$ 164,000	$ 39,000
Amortized cost on available for sale securities held at gross unrealized losses	$ 124,100,000	$ 72,600,000
Number of securities	43	37

Disclosure regarding factors used to determine that the impairment of securities not categorized as either held-to-maturity securities or trading securities (hence equal to available for sale securities) where cost exceeds fair value is not an other than temporary impairment (OTTI). This item contains disclosure of the number of investment positions in the available-for-sale investments determined to be temporarily impaired.

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