Note L - Business Segments and Foreign Operations - Reconciliation of Reportable Segment Net Sales and Net Earnings to Consolidated Totals (Details) - USD ($) $ in Thousands	12 Months Ended
	Jun. 30, 2019	Jun. 30, 2018
Net Sales	$ 302,663	$ 240,733
Net earnings attributable to Twin Disc	10,673	9,528
Operating Segments [Member]
Net Sales	386,909	301,071
Net earnings attributable to Twin Disc	25,310	23,866
Intersegment Eliminations [Member]
Net Sales	(84,246)	(60,338)
Corporate, Non-Segment [Member]
Net earnings attributable to Twin Disc	$ (14,637)	$ (14,338)