v2.4.0.8

Auction Rate Securities - ARS Investments (Detail) (USD $) In Thousands, unless otherwise specified | Jun. 29, 2013 | Jun. 30, 2012
--- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |
Estimated Fair Value | $ 367,490 | $ 316,772
Auction Rate Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Investment Securities at Original Cost Basis | 24,000 | 27,350
Other-than- temporary Impairment in Retained Earnings | (13,833) | (14,027)
Investment Securities at New Cost Basis | 10,167 | 13,323
Unrealized Gain/(Loss) | 6,802 | 1,998
Estimated Fair Value | 16,969 | 15,321
Auction Rate Securities [Member] | Student Loans [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Investment Securities at Original Cost Basis | 3,500 | 6,850
Other-than- temporary Impairment in Retained Earnings | (179) | (179)
Investment Securities at New Cost Basis | 3,321 | 6,671
Unrealized Gain/(Loss) | (168) | (231)
Estimated Fair Value | 3,153 | 6,440
Auction Rate Securities [Member] | Credit Linked Notes [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Investment Securities at Original Cost Basis | 13,500 | 13,500
Other-than- temporary Impairment in Retained Earnings | (8,571) | (8,765)
Investment Securities at New Cost Basis | 4,929 | 4,735
Unrealized Gain/(Loss) | 4,980 | 2,276
Estimated Fair Value | 9,909 | 7,011
Auction Rate Securities [Member] | Preferred Stock [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Investment Securities at Original Cost Basis | 5,000 | 5,000
Other-than- temporary Impairment in Retained Earnings | (5,000) | (5,000)
Investment Securities at New Cost Basis |  |
Unrealized Gain/(Loss) | 2,000 |
Estimated Fair Value | 2,000 |
Auction Rate Securities [Member] | Municipals [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Investment Securities at Original Cost Basis | 2,000 | 2,000
Other-than- temporary Impairment in Retained Earnings | (83) | (83)
Investment Securities at New Cost Basis | 1,917 | 1,917
Unrealized Gain/(Loss) | (10) | (47)
Estimated Fair Value | $ 1,907 | $ 1,870

X
- Definition Amount of accumulated pre-tax unrealized gains before deducting pre-tax unrealized losses on investments in available-for-sale securities impacting investments. + References No definition available. + Details
Name: | syna_AvailableForSaleDebtSecuritiesGrossUnrealizedGainAccumulatedInInvestments
Namespace Prefix: | syna_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Cumulative other than temporary impairment included in retained earnings. + References No definition available. + Details
Name: | syna_CumulativeOtherThanTemporaryImpairmentIncludedInRetainedEarnings
Namespace Prefix: | syna_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Investment securities at new cost basis. + References No definition available. + Details
Name: | syna_InvestmentSecuritiesAtNewCostBasis
Namespace Prefix: | syna_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Investment securities at original cost basis. + References No definition available. + Details
Name: | syna_InvestmentSecuritiesAtOriginalCostBasis
Namespace Prefix: | syna_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=28360136&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27232-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26610-111562 + Details
Name: | us-gaap_AvailableForSaleSecurities
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Details
Name: | us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration