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Note 15 - Financial Instruments and Fair Value Measurements (Details) - Estimated Fair Value of Financial Instruments, Current Year (USD $) In Thousands, unless otherwise specified	Jun. 29, 2014	Dec. 29, 2013
Short-Term Investments
Available for Sale Securities	$ 45,450	$ 49,099
Commercial Paper, Not Included with Cash and Cash Equivalents [Member] | Fair Value, Inputs, Level 1 [Member]
Short-Term Investments
Available for Sale Securities	31,452	21,993
Commercial Paper, Not Included with Cash and Cash Equivalents [Member]
Short-Term Investments
Available for Sale Securities	31,452	21,993
Corporate Bond Securities [Member] | Fair Value, Inputs, Level 1 [Member]
Short-Term Investments
Available for Sale Securities	11,838	27,106
Corporate Bond Securities [Member]
Short-Term Investments
Available for Sale Securities	11,838	27,106
Certificates of Deposit [Member] | Fair Value, Inputs, Level 1 [Member]
Short-Term Investments
Available for Sale Securities	2,160
Certificates of Deposit [Member]
Short-Term Investments
Available for Sale Securities	$ 2,160

X

- Details

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Namespace Prefix:	laco_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 25

-Paragraph 1

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=28360136&loc=d3e22054-111558



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 50

-Paragraph 5

-Subparagraph (aa)

-URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27232-111563



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 45

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26610-111562

+ Details

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