v3.8.0.1
Document And Entity Information - shares
9 Months Ended
Mar. 30, 2018
May 04, 2018
Document Information [Line Items]    
Entity Registrant Name TWIN DISC INC  
Entity Central Index Key 0000100378  
Trading Symbol twin  
Current Fiscal Year End Date --06-30  
Entity Filer Category Accelerated Filer  
Entity Current Reporting Status Yes  
Entity Voluntary Filers No  
Entity Well-known Seasoned Issuer No  
Entity Common Stock, Shares Outstanding (in shares)   11,551,285
Document Type 10-Q  
Document Period End Date Mar. 30, 2018  
Document Fiscal Year Focus 2018  
Document Fiscal Period Focus Q3  
Amendment Flag false