Note J - Business Segments and Foreign Operations - Segment Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Jun. 30, 2021	Jun. 30, 2020
Net Sales	$ 218,581	$ 246,838
Intra-segment sales	24,182	27,119
Inter-segment sales	48,968	49,432
Interest income	19	78
Interest expense	2,358	1,860
Income taxes	19,680	(4,169)
Depreciation and amortization	11,243	11,925
Net income attributable to Twin Disc	(29,719)	(39,817)
Assets	275,413	294,127
Expenditures for segment assets	4,464	10,699
Manufacturing Segment [Member]
Intra-segment sales	9,436	14,230
Inter-segment sales	44,575	43,854
Distribution Segment [Member]
Intra-segment sales	14,746	12,889
Inter-segment sales	4,393	5,578
Operating Segments [Member]
Net Sales	291,731	323,389
Interest income	189	368
Interest expense	2,450	2,128
Income taxes	(791)	(1,759)
Depreciation and amortization	10,867	11,530
Net income attributable to Twin Disc	11,121	(31,050)
Assets	411,335	408,535
Expenditures for segment assets	3,688	10,349
Operating Segments [Member] | Manufacturing Segment [Member]
Net Sales	191,510	227,565
Interest income	172	346
Interest expense	2,449	2,128
Income taxes	(980)	(2,027)
Depreciation and amortization	10,455	11,151
Net income attributable to Twin Disc	11,016	(31,603)
Assets	364,379	365,417
Expenditures for segment assets	3,500	9,615
Operating Segments [Member] | Distribution Segment [Member]
Net Sales	100,221	95,824
Interest income	17	22
Interest expense	1	0
Income taxes	189	268
Depreciation and amortization	412	379
Net income attributable to Twin Disc	105	553
Assets	46,956	43,118
Expenditures for segment assets	$ 188	$ 734