Document and Entity Information (USD $)	12 Months Ended
	Jun. 30, 2013	Aug. 16, 2013	Dec. 28, 2012
Document and Entity Information [Abstract]
Entity Registrant Name	TWIN DISC INC
Entity Central Index Key	0000100378
Current Fiscal Year End Date	--06-30
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Filer Category	Accelerated Filer
Entity Public Float			$ 140,548,703
Entity Common Stock, Shares Outstanding		11,255,519
Document Fiscal Year Focus	2013
Document Fiscal Period Focus	FY
Document Type	10-K
Amendment Flag	false
Document Period End Date	Jun. 30, 2013