XML 73 R58.htm IDEA: XBRL DOCUMENT
v3.8.0.1

Share-Based Compensation - Market Stock Units - Additional Information (Detail) - Market stock units outstanding [Member] $ in Millions | 6 Months Ended
--- | ---
Dec. 31, 2017 USD ($)
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |
Potential payout adjustment ratio | 200.00%
Unrecognized share-based compensation cost | $ 20.8
Unrecognized share-based compensation, period for recognition | 1 year 7 months 7 days
Minimum [Member] |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |
Potential payout range | 0.00%
Maximum [Member] |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |
Potential payout range | 200.00%
Share-based Compensation Award, First Tranche [Member] |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |
Vesting period of the underlying awards | 1 year
Vesting percentage of the underlying awards | 33.33%
Share-based Compensation Award, First Tranche [Member] | Maximum [Member] |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |
Potential payout range | 100.00%
Share-based Compensation Award, Second Tranche [Member] |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |
Vesting period of the underlying awards | 2 years
Vesting percentage of the underlying awards | 33.33%
Share-based Compensation Award, Second Tranche [Member] | Maximum [Member] |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |
Potential payout range | 100.00%
Share-based Compensation Award, Third Tranche [Member] |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |
Vesting period of the underlying awards | 3 years
Vesting percentage of the underlying awards | 33.33%

X
- Definition Percentage of potential payout. + References No definition available. + Details
Name: | syna_PercentageOfPotentialPayout
Namespace Prefix: | syna_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Potential payout adjustment ratio. + References No definition available. + Details
Name: | syna_PotentialPayoutAdjustmentRatio
Namespace Prefix: | syna_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
Name: | us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1
Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Unrecognized cost of unvested share-based awards, other than options, awarded to employees as compensation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
Name: | us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions
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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=96867065&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 Percentage of vesting of share-based compensation awards. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
Name: | us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_AwardTypeAxis=syna_MarketStockUnitsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RangeAxis=us-gaap_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RangeAxis=us-gaap_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_VestingAxis=us-gaap_ShareBasedCompensationAwardTrancheOneMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_VestingAxis=us-gaap_ShareBasedCompensationAwardTrancheTwoMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_VestingAxis=us-gaap_ShareBasedCompensationAwardTrancheThreeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |