Document And Entity Information - shares	3 Months Ended
	Sep. 28, 2018	Nov. 02, 2018
Document Information [Line Items]
Entity Registrant Name	TWIN DISC INC
Entity Central Index Key	0000100378
Trading Symbol	twin
Current Fiscal Year End Date	--06-17
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)		13,087,512
Document Type	10-Q
Document Period End Date	Sep. 28, 2018
Document Fiscal Year Focus	2019
Document Fiscal Period Focus	Q1
Amendment Flag	false