v2.4.0.8

Net Income Per Share - Additional Information (Detail) (USD $)	12 Months Ended
	Jun. 29, 2013
Earnings Per Share [Abstract]
Minimum weighted average price of common stock for share associated with convertible notes to be include in calculation of diluted net income per share	$ 33.69

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- Definition

Minimum weighted average price of common stock for share associated with convertible notes to be include in calculation of diluted net income per share.

+ References

No definition available.

+ Details

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Namespace Prefix:	syna_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	duration

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- Details

Name:	us-gaap_EarningsPerShareAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration