Document And Entity Information (USD $)	12 Months Ended
	Dec. 31, 2011	Jun. 30, 2011	Feb. 16, 2012 Common Class B [Member]	Feb. 16, 2012 Common Class A [Member]
Entity Registrant Name	K SWISS INC
Document Type	10-K
Current Fiscal Year End Date	--12-31
Entity Common Stock, Shares Outstanding			8,039,524	27,561,304
Entity Public Float		$ 289,016,391
Amendment Flag	false
Entity Central Index Key	0000862480
Entity Current Reporting Status	Yes
Entity Voluntary Filers	No
Entity Filer Category	Accelerated Filer
Entity Well-known Seasoned Issuer	No
Document Period End Date	Dec. 31, 2011
Document Fiscal Year Focus	2011
Document Fiscal Period Focus	FY