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						9 Months Ended
	Mar. 29, 2019	Dec. 28, 2018	Sep. 28, 2018	Mar. 30, 2018	Dec. 29, 2017	Sep. 29, 2017	Mar. 29, 2019	Mar. 30, 2018
Basic:
Net income	$ 4,587	$ 4,079	$ 2,902	$ 4,336	$ (4,050)	$ 3,404	$ 11,569	$ 3,690
Less: Net earnings attributable to noncontrolling interest	(27)			(28)			(75)	(104)
Less: Undistributed earnings attributable to unvested shares	(59)			(98)			(166)	(86)
Net income available to Twin Disc shareholders	$ 4,501			$ 4,210			$ 11,328	$ 3,500
Weighted average shares outstanding - basic (in shares)	12,914			11,313			12,437	11,289
Basic Income Per Share:
Net income per share - basic (in dollars per share)	$ 0.35			$ 0.37			$ 0.91	$ 0.31
Diluted:
Net income	$ 4,587	$ 4,079	$ 2,902	$ 4,336	$ (4,050)	$ 3,404	$ 11,569	$ 3,690
Less: Net earnings attributable to noncontrolling interest	(27)			(28)			(75)	(104)
Less: Undistributed earnings attributable to unvested shares	(59)			(98)			(166)	(86)
Net income available to Twin Disc shareholders	$ 4,501			$ 4,210			$ 11,328	$ 3,500
Weighted average shares outstanding - basic (in shares)	12,914			11,313			12,437	11,289
Effect of dilutive stock awards (in shares)	232			31			215	31
Weighted average shares outstanding - diluted (in shares)	13,146			11,344			12,652	11,320
Diluted Income Per Share:
Net income per share - diluted (in dollars per share)	$ 0.34			$ 0.37			$ 0.90	$ 0.31