Document And Entity Information - shares	9 Months Ended
	Mar. 29, 2019	Apr. 30, 2019
Document Information [Line Items]
Entity Registrant Name	TWIN DISC INC
Entity Central Index Key	0000100378
Trading Symbol	twin
Current Fiscal Year End Date	--06-30
Entity Filer Category	Accelerated Filer
Entity Current Reporting Status	Yes
Entity Emerging Growth Company	false
Entity Small Business	true
Entity Common Stock, Shares Outstanding (in shares)		13,098,512
Document Type	10-Q
Document Period End Date	Mar. 29, 2019
Document Fiscal Year Focus	2019
Document Fiscal Period Focus	Q3
Amendment Flag	false