Note J - 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, 2017	Jun. 30, 2016	Jun. 30, 2015
Net Sales	$ 168,182	$ 166,282	$ 265,790
Net earnings attributable to Twin Disc	(6,294)	(13,104)	11,173
Operating Segments [Member]
Net Sales	214,295	215,164	353,139
Net earnings attributable to Twin Disc	3,067	(11,932)	19,211
Intersegment Eliminations [Member]
Net Sales	(46,113)	(48,882)	(87,349)
Corporate, Non-Segment [Member]
Net earnings attributable to Twin Disc	$ (9,361)	$ (1,172)	$ (8,038)