Note R - Earnings Per Share - Components of Basic and Diluted Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Jun. 30, 2020	Jun. 30, 2019
Basic:
Net (loss) income	$ (39,571)	$ 10,796
Less: Net earnings attributable to noncontrolling interest	(246)	(123)
Less: Undistributed earnings attributable to unvested shares		(148)
Net (loss) income available to Twin Disc shareholders	$ (39,817)	$ 10,525
Weighted average shares outstanding - basic (in shares)	13,153	12,571
Basic (Loss) Income Per Share:
Net (loss) income per share - basic (in dollars per share)	$ (3.03)	$ 0.84
Diluted:
Net (loss) income	$ (39,571)	$ 10,796
Less: Net earnings attributable to noncontrolling interest	(246)	(123)
Less: Undistributed earnings attributable to unvested shares		(148)
Net (loss) income available to Twin Disc shareholders	$ (39,817)	$ 10,525
Weighted average shares outstanding - basic (in shares)	13,153	12,571
Effect of dilutive stock awards (in shares)		111
Weighted average shares outstanding - diluted (in shares)	13,153	12,682
Diluted (Loss) Income Per Share:
Net (loss) income per share - diluted (in dollars per share)	$ (3.03)	$ 0.83