Note O - Earnings Per Share - Components of Basic and Diluted Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended				6 Months Ended
	Dec. 28, 2018	Sep. 28, 2018	Dec. 29, 2017	Sep. 29, 2017	Dec. 28, 2018	Dec. 29, 2017
Basic:
Net income (loss)	$ 4,079	$ 2,903	$ (4,050)	$ 3,404	$ 6,982	$ (646)
Less: Net earnings attributable to noncontrolling interest	(6)		(63)		(47)	(76)
Less: Undistributed earnings attributable to unvested shares	(53)				(105)
Net income (loss) available to Twin Disc shareholders	$ 4,020		$ (4,113)		$ 6,830	$ (722)
Weighted average shares outstanding - basic (in shares)	12,909		11,297		12,233	11,278
Basic Income (Loss) Per Share:
Net income (loss) per share - basic (in dollars per share)	$ 0.31		$ (0.36)		$ 0.56	$ (0.06)
Diluted:
Net income (loss)	$ 4,079	$ 2,903	$ (4,050)	$ 3,404	$ 6,982	$ (646)
Less: Net earnings attributable to noncontrolling interest	(6)		(63)		(47)	(76)
Less: Undistributed earnings attributable to unvested shares	(53)				(105)
Net income (loss) available to Twin Disc shareholders	$ 4,020		$ (4,113)		$ 6,830	$ (722)
Weighted average shares outstanding - basic (in shares)	12,909		11,297		12,233	11,278
Effect of dilutive stock awards (in shares)	88				71
Weighted average shares outstanding - diluted (in shares)	12,997		11,297		12,304	11,278
Diluted Income (Loss) Per Share:
Net income (loss) per share - diluted (in dollars per share)	$ 0.31		$ (0.36)		$ 0.56	$ (0.06)