v2.4.0.6

Marketable Securities (Narrative) (Details) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2012 | Mar. 26, 2011
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Schedule of Available-for-sale Securities [Line Items] |  |
Minimum maturity period of investments to be classified as available-for-sale securities | 90 days |
Gross unrealized losses | $ 39 | $ 47
Amortized costs | 118,783 | 172,214
28 Different Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Gross unrealized losses |  | 47
Amortized costs |  | 61,800
Number of securities |  | 28
37 Different Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Gross unrealized losses | 39 |
Amortized costs | $ 72,600 |
Number of securities | 37 |

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