Note M - Earnings Per Share - Components of Basic and Diluted Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Mar. 30, 2018	Mar. 31, 2017	Mar. 30, 2018	Mar. 31, 2017
Basic:
Net income (loss)	$ 4,336	$ (1,728)	$ 3,690	$ (7,290)
Less: Net earnings attributable to noncontrolling interest	(28)	(121)	(104)	(166)
Less: Undistributed earnings attributable to unvested shares	(98)		(86)
Net income (loss) available to Twin Disc shareholders	$ 4,210	$ (1,849)	$ 3,500	$ (7,456)
Weighted average shares outstanding - basic (in shares)	11,313	11,250	11,289	11,236
Basic Income (Loss) Per Share:
Net income (loss) per share - basic (in dollars per share)	$ 0.37	$ (0.16)	$ 0.31	$ (0.66)
Diluted:
Net income (loss)	$ 4,336	$ (1,728)	$ 3,690	$ (7,290)
Less: Net earnings attributable to noncontrolling interest	(28)	(121)	(104)	(166)
Less: Undistributed earnings attributable to unvested shares	(98)		(86)
Net income (loss) available to Twin Disc shareholders	$ 4,210	$ (1,849)	$ 3,500	$ (7,456)
Weighted average shares outstanding - basic (in shares)	11,313	11,250	11,289	11,236
Effect of dilutive stock awards (in shares)	31		31
Weighted average shares outstanding - diluted (in shares)	11,344	11,250	11,320	11,236
Diluted Income (Loss) Per Share:
Net income (loss) per share - diluted (in dollars per share)	$ 0.37	$ (0.16)	$ 0.31	$ (0.66)