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Cash, Cash Equivalents And Short Term Investments (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended	12 Months Ended
	Sep. 27, 2013	Dec. 28, 2012
Fair Value Measurements [Line Items]
Amortized Cost	$ 135,046	$ 134,109
Unrealized Gains	3	41
Unrealized Losses	(6)	(1)
Estimated Fair Value	135,043	134,149
Cash
Fair Value Measurements [Line Items]
Amortized Cost	64,809	64,134
Unrealized Gains	0	0
Unrealized Losses	0	0
Estimated Fair Value	64,809	64,134
Money market securities
Fair Value Measurements [Line Items]
Amortized Cost	56,938	49,134
Unrealized Gains	0	0
Unrealized Losses	0	0
Estimated Fair Value	56,938	49,134
Total cash equivalents
Fair Value Measurements [Line Items]
Amortized Cost	56,938	49,134
Unrealized Gains	0	0
Unrealized Losses	0	0
Estimated Fair Value	56,938	49,134
Total cash and cash equivalents
Fair Value Measurements [Line Items]
Amortized Cost	121,747	113,268
Unrealized Gains	0	0
Unrealized Losses	0	0
Estimated Fair Value	121,747	113,268
State and municipal bonds
Fair Value Measurements [Line Items]
Amortized Cost	13,299	20,841
Unrealized Gains	3	41
Unrealized Losses	(6)	(1)
Estimated Fair Value	13,296	20,881
Total short-term investments
Fair Value Measurements [Line Items]
Amortized Cost	13,299	20,841
Unrealized Gains	3	41
Unrealized Losses	(6)	(1)
Estimated Fair Value	$ 13,296	$ 20,881

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- Definition

This item represents the fair value of cash, cash equivalents and short-term investments.

+ References

No definition available.

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- Definition

This item represents the cost of debt securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any.

+ References

No definition available.

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- Definition

Amount of unrealized gain before deducting unrealized loss on investments in debt securities classified as available-for-sale securities.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27161-111563

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- Definition

Amount of unrealized loss before deducting unrealized gain on investments in available-for-sale debt securities.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27161-111563

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