Schedule II - VALUATION AND QUALIFYING ACCOUNTS (Details) - USD ($) $ in Thousands	12 Months Ended
Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2017
Allowance for doubtful accounts
VALUATION AND QUALIFYING ACCOUNTS
Balance at Beginning of Year	$ 122	$ 607	$ 667
Charged (Credited) to Statement of Operations	840	(404)	47
Claims and Adjustments Applied Against Allowances	(878)	(81)	(107)
Balance at End of Year	84	122	607
Allowance for sales returns
VALUATION AND QUALIFYING ACCOUNTS
Balance at Beginning of Year	25,515	18,800	18,526
Charged (Credited) to Statement of Operations	94,381	111,969	78,242
Claims and Adjustments Applied Against Allowances	(113,410)	(105,254)	(77,968)
Balance at End of Year	6,486	25,515	18,800
Allowance for cooperative marketing arrangements
VALUATION AND QUALIFYING ACCOUNTS
Balance at Beginning of Year	30,389	28,022	28,157
Charged (Credited) to Statement of Operations	176,323	160,664	144,656
Claims and Adjustments Applied Against Allowances	(171,632)	(158,297)	(144,791)
Balance at End of Year	35,080	30,389	28,022
Allowance for customer incentive programs
VALUATION AND QUALIFYING ACCOUNTS
Balance at Beginning of Year	70,592	60,857	60,872
Charged (Credited) to Statement of Operations	237,580	230,838	196,363
Claims and Adjustments Applied Against Allowances	(248,136)	(221,103)	(196,378)
Balance at End of Year	60,036	70,592	60,857
Allowance for pricing programs
VALUATION AND QUALIFYING ACCOUNTS
Balance at Beginning of Year	141,369	102,289	81,553
Charged (Credited) to Statement of Operations	444,540	445,048	322,118
Claims and Adjustments Applied Against Allowances	(497,556)	(405,968)	(301,382)
Balance at End of Year	88,353	141,369	102,289
Tax valuation allowances
VALUATION AND QUALIFYING ACCOUNTS
Balance at Beginning of Year	25,148	6,626	5,338
Charged (Credited) to Statement of Operations	3,244	18,496	1,299
Claims and Adjustments Applied Against Allowances	(17)	26	(11)
Balance at End of Year	28,375	25,148	$ 6,626
Accounting Standards Update 2014-09
VALUATION AND QUALIFYING ACCOUNTS
Charged (Credited) to Statement of Operations	(105,800)
Accounting Standards Update 2014-09 \| Allowance for sales returns
VALUATION AND QUALIFYING ACCOUNTS
Charged (Credited) to Statement of Operations	(20,000)
Accounting Standards Update 2014-09 \| Allowance for cooperative marketing arrangements
VALUATION AND QUALIFYING ACCOUNTS
Charged (Credited) to Statement of Operations	(3,200)
Accounting Standards Update 2014-09 \| Allowance for customer incentive programs
VALUATION AND QUALIFYING ACCOUNTS
Charged (Credited) to Statement of Operations	(18,700)
Accounting Standards Update 2014-09 \| Allowance for pricing programs
VALUATION AND QUALIFYING ACCOUNTS
Charged (Credited) to Statement of Operations	$ (63,800)
Accounting Standards Update 2016-09
VALUATION AND QUALIFYING ACCOUNTS
Charged (Credited) to Statement of Operations		$ 18,000

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

No definition available.

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

- Definition

Amount of increase (decrease) in valuation and qualifying accounts and reserves from adjustment.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 4
-Subparagraph (SX 210.12-09)
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24092-122690

+ Details

Name:	us-gaap_ValuationAllowancesAndReservesAdjustments
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Amount of valuation and qualifying accounts and reserves.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 4
-Subparagraph (SX 210.12-09)
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24092-122690

+ Details

Name:	us-gaap_ValuationAllowancesAndReservesBalance
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of increase in valuation and qualifying accounts and reserves from charge to cost and expense.

+ References

+ Details

Name:	us-gaap_ValuationAllowancesAndReservesChargedToCostAndExpense
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Details

Name:	us-gaap_ValuationAllowancesAndReservesTypeAxis=logi_AllowanceforDoubtfulAccounts1Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_ValuationAllowancesAndReservesTypeAxis=logi_SECSchedule1209AllowanceSalesReturnsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_ValuationAllowancesAndReservesTypeAxis=logi_AllowanceForCooperativeMarketingArrangementsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_ValuationAllowancesAndReservesTypeAxis=logi_AllowanceForCustomerIncentiveProgramsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_ValuationAllowancesAndReservesTypeAxis=logi_AllowanceForPricingProgramsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_ValuationAllowancesAndReservesTypeAxis=us-gaap_ValuationAllowanceOfDeferredTaxAssetsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_AdjustmentsForNewAccountingPronouncementsAxis=us-gaap_AccountingStandardsUpdate201409Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_AdjustmentsForNewAccountingPronouncementsAxis=us-gaap_AccountingStandardsUpdate201609Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: