Note L - Business Segments and Foreign Operations - Segment Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Jun. 30, 2019	Jun. 30, 2018
Net Sales	$ 302,663	$ 240,733
Intra-segment sales	34,410	31,655
Inter-segment sales	49,836	28,683
Interest income	43	55
Interest expense	1,927	282
Income taxes	3,711	4,773
Depreciation and amortization	9,335	6,464
Net income attributable to Twin Disc	10,673	9,528
Assets	346,870	241,240
Expenditures for segment assets	11,979	6,328
Manufacturing Segment [Member]
Intra-segment sales	20,384	22,912
Inter-segment sales	46,078	26,074
Distribution Segment [Member]
Intra-segment sales	14,026	8,743
Inter-segment sales	3,758	2,609
Operating Segments [Member]
Net Sales	386,909	301,071
Interest income	1,180	34
Interest expense	3,049	275
Income taxes	8,292	16,370
Depreciation and amortization	13,295	6,084
Net income attributable to Twin Disc	25,310	23,866
Assets	430,688	318,647
Expenditures for segment assets	11,388	5,730
Operating Segments [Member] | Manufacturing Segment [Member]
Net Sales	280,428	216,383
Interest income	1,154	16
Interest expense	3,086	275
Income taxes	7,939	15,782
Depreciation and amortization	12,893	5,632
Net income attributable to Twin Disc	25,062	22,799
Assets	384,612	266,417
Expenditures for segment assets	10,725	5,482
Operating Segments [Member] | Distribution Segment [Member]
Net Sales	106,481	84,688
Interest income	26	18
Interest expense	(37)
Income taxes	353	588
Depreciation and amortization	402	452
Net income attributable to Twin Disc	248	1,067
Assets	46,076	52,230
Expenditures for segment assets	$ 663	$ 248