Note B - Acquisition of Veth Propulsion Holding BV - Unaudited Supplemental Pro Forma Information (Details) - Veth Propulsion [Member] - USD ($) $ / shares in Units, shares in Thousands		3 Months Ended	9 Months Ended
		Mar. 30, 2018	Mar. 30, 2018
Net sales		$ 78,615,000	$ 209,517,000
Gross profit	[1]	23,384,000	61,993,000
Net income attributable to Twin Disc	[2]	$ 2,859	$ 784
Basic income per share attributable to Twin Disc common shareholders (in dollars per share)		$ 0.25	$ 0.07
Diluted income per share attributable to Twin Disc common shareholders (in dollars per share)		$ 0.25	$ 0.07
Basic (in shares)		11,313	11,289
Diluted (in shares)		11,344	11,320

[1] Gross profit includes the amortization of the step-up of inventories of $1,179 and $3,537 for the quarter and three quarters ended March 30, 2018, 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 $3,408, before tax, for the quarter and three quarters ended March 30, 2018, respectively.