Consolidated Statements of Comprehensive Income (Loss) (Parenthetical) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Jun. 30, 2013	Jul. 01, 2012	Jul. 03, 2011
Statement Of Income And Comprehensive Income [Abstract]
Tax effect of Unrealized gain (loss) on short-term investments	$ 48	$ 2	$ 25

Accumulated Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax

No definition available.

Name:	symm_AccumulatedOtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax
Namespace Prefix:	symm_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration