The additional amount of increase in legal reserve during the period.

No definition available.

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- Definition

Refers to number of patents infringed by the plaintiff.

+ References

No definition available.

+ Details

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- Definition

Amount of minimum lease payments for capital leases.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 840

-SubTopic 30

-Section 50

-Paragraph 1

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=6455398&loc=d3e45280-112737

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- Definition

Amount of minimum lease payments for capital leases due in the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

+ References

+ Details

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- Definition

Amount of minimum lease payments for capital leases due in the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

+ References

+ Details

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- Definition

Amount of minimum lease payments for capital leases due in the fourth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

+ References

+ Details

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- Definition

Amount of minimum lease payments for capital leases due in the third fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

+ References

+ Details

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- Definition

Amount of minimum lease payments for capital leases due in the second fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

+ References

+ Details

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- Definition

Amount of minimum lease payments for capital leases due after the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

+ References

+ Details

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Data Type:	xbrli:stringItemType
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- Definition

The amount the liability recorded for the income tax examination increased or decreased in the current year/accounting period.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 740

-SubTopic 10

-Section 50

-Paragraph 15

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32718-109319

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- Definition

The amount of the additional liability or refund received or expected based on a final settlement with a taxing authority.

+ References

+ Details

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- Definition

Amount of rent expense incurred for leased assets, including but not limited to, furniture and equipment, that is not directly or indirectly associated with the manufacture, sale or creation of a product or product line.

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The amount of expense provided in the period for legal costs incurred on or before the balance sheet date pertaining to resolved, pending or threatened litigation, including arbitration and mediation proceedings.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SX 210.5-03.3)

-URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688

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- Details

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- Definition

Presents an assertion of a fact by a plaintiff in a pleading or complaint, which the plaintiff claims it will prove upon presentation of evidence at the proceeding.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 450

-SubTopic 20

-Section 50

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14326-108349

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 450

-SubTopic 20

-Section 50

-Paragraph 4

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14435-108349

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 450

-SubTopic 20

-Section 50

-Paragraph 9

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14557-108349

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- Definition

Amount of damages awarded to the plaintiff in the legal matter.

+ References

+ Details

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- Definition

The value (monetary amount) of the award the plaintiff seeks in the legal matter.

+ References

+ Details

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Data Type:	xbrli:monetaryItemType
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- Definition

Identifies the domicile or jurisdiction of the court of law, arbitration or mediation proceeding.

+ References

+ Details

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- Definition

States the date the complaint was formally filed in a court of law, in arbitration or mediation.

+ References

+ Details

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- Details

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Commitments and contingencies (Details) (USD $)	12 Months Ended		0 Months Ended	1 Months Ended	9 Months Ended	12 Months Ended
Commitments and contingencies (Details) (USD $)	Dec. 26, 2014	Dec. 27, 2013	Nov. 26, 2012 Patent	Mar. 31, 2007	Sep. 27, 2013	Dec. 28, 2012
Commitments and Contingencies Disclosure [Abstract]
Rental expense	$ 4,500,000us-gaap_LeaseAndRentalExpense	$ 4,600,000us-gaap_LeaseAndRentalExpense
Aggregate minimum rental commitments under non-cancelable leases [Abstract]
2015	3,769,000
2016	2,032,000
2017	1,030,000
2018	769,000
2019	467,000
Thereafter	205,000
Total rent expense	8,272,000
Halo [Member]
Commitments [Line Items]
Lawsuit filing date				March 1, 2007
Domicile of Litigation				United States District Court, District of Nevada
Plaintiff allegations				The plaintiff, Halo, claims that we infringed certain U.S. patents related to an electronic surface mount package, and is seeking injunctive relief and damages.
Number of patents infringed			3
Damage and interest payable amount			2,000,000
Amount of bond held in an interest-bearing account					1,600,000
Legal expenses	700,000	1,300,000
Foreign Tax Authority [Member]
Commitments [Line Items]
Judgment ordered						3,700,000
Increase in legal reserve						3,700,000
(Decrease) increase in Legal reserve	$ (300,000)