Note K - 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, 2020	Jun. 30, 2019
Net Sales	$ 246,838	$ 302,663
Net earnings attributable to Twin Disc	(39,817)	10,673
Operating Segments [Member]
Net Sales	323,389	386,909
Net earnings attributable to Twin Disc	(31,050)	25,310
Intersegment Eliminations [Member]
Net Sales	(76,551)	(84,246)
Corporate, Non-Segment [Member]
Net earnings attributable to Twin Disc	$ (8,767)	$ (14,637)