Cash, Cash Equivalents and Investments (Details 3) (USD $) In Thousands, unless otherwise specified	Jul. 01, 2012
Effective maturity dates of available-for-sale investments
Less than 1 Year	$ 59,590
1-2 Years	47,513
2-3 Years	46,697
3-4 Years	10,100
4-5 Years	9,251
5-7 years	5,625
Fair Value, Total	178,776
Municipal bonds [Member]
Effective maturity dates of available-for-sale investments
Less than 1 Year	39,827
1-2 Years	32,506
2-3 Years	29,458
3-4 Years	10,100
4-5 Years	5,680
5-7 years	5,122
Fair Value, Total	122,693
Corporate bonds [Member]
Effective maturity dates of available-for-sale investments
Less than 1 Year	18,162
1-2 Years	10,124
2-3 Years	14,202
4-5 Years	3,571
Fair Value, Total	46,059
Asset-backed securities [Member]
Effective maturity dates of available-for-sale investments
Less than 1 Year	1,601
2-3 Years	3,037
5-7 years	503
Fair Value, Total	5,141
Sovereign Bonds [Member]
Effective maturity dates of available-for-sale investments
1-2 Years	3,882
Fair Value, Total	3,882
Agency bonds [Member]
Effective maturity dates of available-for-sale investments
1-2 Years	1,001
Fair Value, Total	$ 1,001