v2.4.0.8

Stockholders' Equity - Additional Information (Detail) (USD $) In Millions, except Share data, unless otherwise specified	12 Months Ended
	Jun. 29, 2013	Jun. 30, 2012
Equity [Abstract]
Preferred stock, shares authorized	10,000,000	10,000,000
Additional amount authorized by board of director under stock repurchase program	$ 100
Stock repurchase program authorized amount	620.0
Common stock repurchase program expiry date	October 2015
Stock repurchase program remaining authorized amount	$ 159.8

X

- Definition

Additional amount authorized by board of director under stock repurchase program.

+ References

No definition available.

+ Details

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Namespace Prefix:	syna_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Common stock repurchase program expiry date.

+ References

No definition available.

+ Details

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Namespace Prefix:	syna_
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Period Type:	instant

X

- Details

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X

- Definition

The maximum number of nonredeemable preferred shares (or preferred stock redeemable solely at the option of the issuer) permitted to be issued by an entity's charter and bylaws.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.28)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682



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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 29

-Article 5

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Balance Type:	na
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X

- Definition

Amount of a stock repurchase plan authorized by an entity's Board of Directors.

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
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X

- Definition

Amount remaining of a stock repurchase plan authorized by an entity's Board of Directors.

+ References

No definition available.

+ Details

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Balance Type:	credit
Period Type:	duration