Number Of Claims In Lawsuit

Name:	fcs_NumberOfClaimsInLawsuit
Namespace Prefix:	fcs
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Number Of Company Subsidiaries Included In Complaint

+ Details

Name:	fcs_NumberOfCompanySubsidiariesIncludedInComplaint
Namespace Prefix:	fcs
Data Type:	xbrli:decimalItemType
Balance Type:	na
Period Type:	duration

- Definition

Number Of Outstanding Proceedings With Power Integrations

+ Details

Name:	fcs_NumberOfOutstandingProceedingsWithPowerIntegrations
Namespace Prefix:	fcs
Data Type:	xbrli:decimalItemType
Balance Type:	na
Period Type:	duration

- Definition

Number Of Patents Dropped From Case

+ Details

Name:	fcs_NumberOfPatentsDroppedFromCase
Namespace Prefix:	fcs
Data Type:	xbrli:decimalItemType
Balance Type:	na
Period Type:	duration

- Definition

Number Of Patents In Lawsuit

+ Details

Name:	fcs_NumberOfPatentsInLawsuit
Namespace Prefix:	fcs
Data Type:	xbrli:decimalItemType
Balance Type:	na
Period Type:	duration

- Definition

Number Of Phases In Trial

+ Details

Name:	fcs_NumberOfPhasesInTrial
Namespace Prefix:	fcs
Data Type:	xbrli:decimalItemType
Balance Type:	na
Period Type:	duration

- Definition

Number Of Products In Violation

+ Details

Name:	fcs_NumberOfProductsInViolation
Namespace Prefix:	fcs
Data Type:	xbrli:decimalItemType
Balance Type:	na
Period Type:	duration

- Definition

Number Of Vendors Included In Lawsuit

+ Details

Name:	fcs_NumberOfVendorsIncludedInLawsuit
Namespace Prefix:	fcs
Data Type:	xbrli:decimalItemType
Balance Type:	na
Period Type:	duration

- Definition

The amount or range of possible amounts of gain that could be realized upon the resolution of a contingency.

+ References

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 5

-Paragraph 17

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 450

-SubTopic 30

-Section 50

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6397426&loc=d3e17499-108355

+ Details

Name:	us-gaap_GainContingencyUnrecordedAmount
Namespace Prefix:	us-gaap
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Aggregate carrying amount of the estimated litigation liability for known or estimated probable loss from litigation, which may include attorneys' fees and other litigation costs.

+ References

+ Details

Name:	us-gaap_LitigationReserve
Namespace Prefix:	us-gaap
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

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

+ 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=6952336&loc=d3e14326-108349

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 450

-SubTopic 20

-Section 50

-Paragraph 4

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=6952336&loc=d3e14435-108349

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 5

-Paragraph 9

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 4: 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=6952336&loc=d3e14557-108349

Reference 5: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 5

-Paragraph 11

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 6: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 5

-Paragraph 10

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 7: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 5

-Paragraph 12

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

Name:	us-gaap_LossContingencyDamagesSoughtValue
Namespace Prefix:	us-gaap
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The estimated maximum amount of possible loss from the contingency.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 450

-SubTopic 20

-Section 50

-Paragraph 9

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=6952336&loc=d3e14557-108349

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

-Publisher FASB

-Name FASB Interpretation (FIN)

-Number 14

-Paragraph 3

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 5

-Paragraph 9, 10, 11, 12

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 450

-SubTopic 20

-Section 50

-Paragraph 4

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=6952336&loc=d3e14435-108349

+ Details

Name:	us-gaap_LossContingencyRangeOfPossibleLossMaximum
Namespace Prefix:	us-gaap
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

The estimated minimum amount of possible loss from the contingency.

+ References

+ Details

Name:	us-gaap_LossContingencyRangeOfPossibleLossMinimum
Namespace Prefix:	us-gaap
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

Contingencies (Details) (USD $)	9 Months Ended			9 Months Ended				1 Months Ended			9 Months Ended
Contingencies (Details) (USD $)	Sep. 25, 2011	Sep. 25, 2011 POWI 4 [Member]	Feb. 10, 2010 POWI 4 [Member]	Sep. 25, 2011 POWI 2 [Member]	Sep. 25, 2011 POWI 3 [Member]	Sep. 25, 2011 Probable Loss [Member]	Sep. 25, 2011 Possible Loss [Member]	Jan. 31, 2011 POWI1 [Member]	Dec. 31, 2008 POWI1 [Member]	Oct. 31, 2006 POWI1 [Member]	Sep. 25, 2011 POWI1 [Member]
Number of outstanding proceedings with power integrations	4
Number of patents in lawsuit		4		3	3						4
Number of claims in lawsuit				$ 1							$ 7
Number of phases in trial											3
Number of products in violation	33
Number of company subsidiaries included in complaint		4			2
Number of patents dropped from case					1
Number of vendors included in lawsuit		7
Damages awarded for infringement of the patents								12,200,000	6,100,000	34,000,000
Assessed damages for infringement of Fairchild patents			17,000,000
Range of possible losses, minimum						13,000,000	0
Range of possible losses, maximum						30,000,000	5,000,000
Potential litigation outcomes						$ 14,700,000	$ 0