Note B - Acquisition of Veth Propulsion Holding BV - Unaudited Supplemental Pro Forma Information (Details) - Veth Propulsion [Member] - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands		3 Months Ended	6 Months Ended
		Dec. 29, 2017	Dec. 29, 2017
Net sales		$ 71,191	$ 130,902
Gross profit (a)	[1]	21,420	38,609
Net loss attributable to Twin Disc (b)	[2]	$ (4,790)	$ (2,075)
Basic loss per share attributable to Twin Disc common shareholders (in dollars per share)		$ (0.42)	$ (0.18)
Diluted loss per share attributable to Twin Disc common shareholders (in dollars per share)		$ (0.42)	$ (0.18)
Basic (in shares)		11,297	11,278
Diluted (in shares)		11,297	11,278

[1] Gross profit includes the amortization of the step-up of inventories of $1,179 and $2,358 for the quarter and two quarters ended December 29, 2017, respectively.

[2] In addition to (a), this includes the amortization of intangible assets acquired and interest expense on borrowings under the Credit Agreement net of other expenses, amounting to $1,136 and $2,271, before tax, for the quarter and two quarters ended December 29, 2017, respectively.