Cover Page - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2020	May 14, 2020	Sep. 30, 2019
Cover [Abstract]
Document Type	10-K
Document Annual Report	true
Document Period End Date	Mar. 31, 2020
Document Transition Report	false
Entity File Number	001-36436
Entity Registrant Name	DECKERS OUTDOOR CORP
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	95-3015862
Entity Address, Address Line One	250 Coromar Drive
Entity Address, City or Town	Goleta
Entity Address, State or Province	CA
Entity Address, Postal Zip Code	93117
City Area Code	805
Local Phone Number	967-7611
Title of 12(b) Security	Common Stock, par value $0.01 per share
Trading Symbol	DECK
Security Exchange Name	NYSE
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Public Float			$ 4,102,074
Entity Common Stock, Shares Outstanding (in shares)		27,999,468
Entity Central Index Key	0000910521
Amendment Flag	false
Current Fiscal Year End Date	--03-31
Document Fiscal Year Focus	2020
Document Fiscal Period Focus	FY