XML 86 R72.htm IDEA: XBRL DOCUMENT v3.10.0.1

Share-Based Compensation - Employee Stock Purchase Plan - Additional Information (Detail) $ in Millions	12 Months Ended
	Jun. 30, 2018 USD ($)
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock purchases under Employee Stock Purchase Plan as a percentage of employee compensation, maximum, subject to legal restrictions and limitations	15.00%
Employee common stock purchases through payroll deductions under Employee Stock Purchase Plan, price as a percentage of fair market value	85.00%
Offering period extends under Employee Stock Purchase Plan	up to two years
Employee Stock Purchase Plan [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Vesting period of the underlying awards	2 years
Expected lives of the implied volatility	6 months
Historical volatility for expected lives	6 months
Unrecognized share-based compensation costs for stock options granted	$ 12.9
Period over which share-based compensation is amortized duration	16 months

X

- Definition

Employee common stock purchases through payroll deductions under employee stock purchase plan, price as a percentage of fair market value.

+ References

No definition available.

+ Details

Name:	syna_EmployeeCommonStockPurchasesThroughPayrollDeductionsUnderEmployeeStockPurchasePlanPriceAsPercentageOfFairMarketValue
Namespace Prefix:	syna_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Offering period extends under employee stock purchase plan.

+ References

No definition available.

+ Details

Name:	syna_OfferingPeriodExtendsUnderEmployeeStockPurchasePlan
Namespace Prefix:	syna_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Period over which share based compensation is amortized duration.

+ References

No definition available.

+ Details

Name:	syna_PeriodOverWhichShareBasedCompensationIsAmortizedDuration
Namespace Prefix:	syna_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Share-based compensation arrangement by share-based payment award fair value Assumptions minimum historical term.

+ References

No definition available.

+ Details

Name:	syna_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsMinimumHistoricalTerm
Namespace Prefix:	syna_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Stock purchases under employee stock purchase plan as a percentage of employee compensation, maximum, subject to legal restrictions and limitations.

+ References

No definition available.

+ Details

Name:	syna_StockPurchasesUnderEmployeeStockPurchasePlanAsCompensationMaximumSubjectToLegalRestrictionsAndLimitations
Namespace Prefix:	syna_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Unrecognized cost of unvested options awarded to employees as compensation.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (i)
-URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901

+ Details

Name:	us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedStockOptions
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901

+ Details

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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

X

- Definition

Expected term of share-based compensation awards, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (f)(2)(i)
-URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SAB Topic 14.D.2)
-URI http://asc.fasb.org/extlink&oid=115993241&loc=d3e301413-122809

+ Details

Name:	us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	us-gaap_PlanNameAxis=syna_EmployeeStockPurchasePlanMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: