Name:	grmn_ShareBasedCompensationArrangementByShareBasedPaymentAwardStockOptionsAndEquityInstrumentsOtherThanOptionsAbstract
Namespace Prefix:	grmn_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

The number of shares into which fully or partially vested stock options outstanding and SAR as of the balance sheet date can be currently converted under the option plan.

No definition available.

Name:	grmn_ShareBasedCompensationArrangementByShareBasedPaymentAwardStockOptionsAndEquityInstrumentsOtherThanOptionsExercisableNumber
Namespace Prefix:	grmn_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of stock options outstanding and SAR and currently exercisable under the stock option plan and SAR.

No definition available.

Name:	grmn_ShareBasedCompensationArrangementByShareBasedPaymentAwardStockOptionsAndEquityInstrumentsOtherThanOptionsExercisableWeightedAverageExercisePrice
Namespace Prefix:	grmn_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	instant

For presentations that combine terminations, the number of shares under stock options and SAR that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan or that expired.

No definition available.

Name:	grmn_ShareBasedCompensationArrangementByShareBasedPaymentAwardStockOptionsAndEquityInstrumentsOtherThanOptionsForfeituresAndExpirationsInPeriod
Namespace Prefix:	grmn_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

Weighted average price of stock options and SAR that were either forfeited or expired.

No definition available.

Name:	grmn_ShareBasedCompensationArrangementByShareBasedPaymentAwardStockOptionsAndEquityInstrumentsOtherThanOptionsForfeituresAndExpirationsInPeriodWeightedAverageExercisePrice
Namespace Prefix:	grmn_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	duration

Number of stock options and SAR outstanding, including both vested and non-vested options.

No definition available.

Name:	grmn_ShareBasedCompensationArrangementByShareBasedPaymentAwardStockOptionsAndEquityInstrumentsOtherThanOptionsOutstandingNumber
Namespace Prefix:	grmn_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

Weighted average price at which grantees can acquire the shares reserved for issuance under the stock options plan and SAR.

No definition available.

Name:	grmn_ShareBasedCompensationArrangementByShareBasedPaymentAwardStockOptionsAndEquityInstrumentsOtherThanOptionsOutstandingWeightedAverageExercisePrice
Namespace Prefix:	grmn_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	instant

Share-based Compensation Arrangement by Share-based Payment Award, Weighted Average Exercise Price [Roll Forward]

No definition available.

Name:	grmn_ShareBasedCompensationArrangementByShareBasedPaymentAwardStockOptionsAndEquityInstrumentsOtherThanOptionsWeightedAverageExercisePriceAbstract
Namespace Prefix:	grmn_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

Weighted average price at which option holders acquired shares when converting their stock options and SAR into shares.

No definition available.

Name:	grmn_ShareBasedCompensationArrangementsByShareBasedPaymentAwardStockOptionsAndEquityInstrumentsOtherThanOptionsExercisesInPeriodWeightedAverageExercisePrice
Namespace Prefix:	grmn_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	duration

Number of share stock options and SAR (or share units) exercised during the current period.

No definition available.