Document and Entity Information	6 Months Ended
	Dec. 28, 2012	Jan. 25, 2013
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 Common Stock, Shares Outstanding		11,243,484
Document Fiscal Year Focus	2013
Document Fiscal Period Focus	Q2
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Dec. 28, 2012