Marketable Securities (Details) (USD $)	3 Months Ended	12 Months Ended
Dec. 29, 2013	Dec. 28, 2014
Schedule of Held-to-maturity Securities [Line Items]
Proceeds from sale of securities	$ 5,500,000
Available-for-sale securities, realized gain	1,100,000
Available for sale securities, realized gain, after tax	700,000
Debt Securities
Schedule of Held-to-maturity Securities [Line Items]
Short-term marketable securities	364,880,000	636,743,000
Long-term marketable securities	176,155,000	167,820,000
Debt Securities \| US Treasury Securities
Schedule of Held-to-maturity Securities [Line Items]
Short-term marketable securities	143,510,000	238,488,000
Debt Securities \| Corporate Debt Securities
Schedule of Held-to-maturity Securities [Line Items]
Short-term marketable securities	78,991,000	208,346,000
Long-term marketable securities	98,979,000	71,191,000
Debt Securities \| US Agency Securities
Schedule of Held-to-maturity Securities [Line Items]
Short-term marketable securities	31,518,000	32,009,000
Long-term marketable securities	73,697,000	95,204,000
Debt Securities \| Municipal Securities
Schedule of Held-to-maturity Securities [Line Items]
Short-term marketable securities	48,035,000	13,622,000
Long-term marketable securities	3,479,000	1,425,000
Debt Securities \| Certificates of Deposit
Schedule of Held-to-maturity Securities [Line Items]
Short-term marketable securities	31,949,000	109,293,000
Debt Securities \| Commercial Paper
Schedule of Held-to-maturity Securities [Line Items]
Short-term marketable securities	$ 30,877,000	34,985,000
Short-term Marketable Securities \| Minimum [Member]
Schedule of Held-to-maturity Securities [Line Items]
Term of investments		1 month
Short-term Marketable Securities \| Maximum [Member]
Schedule of Held-to-maturity Securities [Line Items]
Term of investments		12 months
Long-term Marketable Securities [Member] \| Minimum [Member]
Schedule of Held-to-maturity Securities [Line Items]
Term of investments		13 months
Long-term Marketable Securities [Member] \| Maximum [Member]
Schedule of Held-to-maturity Securities [Line Items]
Term of investments		36 months

Available for Sale Securities, Realized Gain, Net of Tax

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Held-to-maturity Securities, Term

+ References

No definition available.

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This item represents the difference between the gross realized gains and losses realized on the sale of debt or equity securities categorized neither as held-to-maturity nor trading securities. Additionally, this item would include any losses recognized for other than temporary impairments (OTTI) of the subject investments in debt and equity securities.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 50

-Paragraph 9

-Subparagraph (a)

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Amount after other than temporary impairment (OTTI) accretion, of investments in debt securities classified as held-to-maturity, expected to be converted to cash, sold or exchanged within one year or the normal operating cycle.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 45

-Paragraph 2

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-Topic 320

-SubTopic 10

-Section 25

-Paragraph 1

-Subparagraph (c)

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Amount after other than temporary impairment (OTTI) accretion, of investments in debt securities classified as held-to-maturity, not expected to be converted to cash, sold or exchanged within one year or the normal operating cycle, if longer.

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The cash inflow associated with the sale of debt and equity securities classified as available-for-sale securities.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Investing Activities

-URI http://asc.fasb.org/extlink&oid=6516133

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 45

-Paragraph 11

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 12

-Subparagraph (a),(b)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3179-108585

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