| Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Product and Service, Revenue [Table Text Block] |
| | | June 30, 2026 | | | June 30, 2025 | |
| Industrial | | $ | 46,067 | | | $ | 41,502 | |
| Land-based transmissions | | | 89,698 | | | | 80,192 | |
| Marine and propulsion systems | | | 227,675 | | | | 201,101 | |
| Other | | | 17,830 | | | | 17,943 | |
| Total | | $ | 381,270 | | | $ | 340,738 | |
| | | | | | | | | | | Elimination of | | | | | |
| | | Manufacturing | | | Distribution | | | Intercompany Sales | | | Total | |
| Industrial | | $ | 45,622 | | | $ | 4,265 | | | $ | (3,820 | ) | | $ | 46,067 | |
| Land-based transmissions | | | 84,879 | | | | 19,973 | | | | (15,154 | ) | | | 89,698 | |
| Marine and propulsion systems | | | 209,955 | | | | 71,702 | | | | (53,982 | ) | | | 227,675 | |
| Other | | | - | | | | 19,780 | | | | (1,950 | ) | | | 17,830 | |
| Total | | $ | 340,456 | | | $ | 115,720 | | | $ | (74,906 | ) | | $ | 381,270 | |
| | | | | | | | | | | Elimination of | | | | | |
| | | Manufacturing | | | Distribution | | | Intercompany Sales | | | Total | |
| Industrial | | $ | 40,717 | | | $ | 5,176 | | | $ | (4,391 | ) | | $ | 41,502 | |
| Land-based transmissions | | | 76,171 | | | | 16,621 | | | | (12,600 | ) | | | 80,192 | |
| Marine and propulsion systems | | | 178,553 | | | | 90,196 | | | | (67,648 | ) | | | 201,101 | |
| Other | | | 109 | | | | 18,963 | | | | (1,129 | ) | | | 17,943 | |
| Total | | $ | 295,550 | | | $ | 130,956 | | | $ | (85,768 | ) | | $ | 340,738 | |
|
| Segment Reporting [Table Text Block] |
| | | Manufacturing | | | Distribution | | | Corporate | | | Elimination and adjustments | | | Consolidated | |
| Net sales: | | | | | | | | | | | | | | | | | | | | |
| Net sales | | $ | 340,456 | | | $ | 115,720 | | | $ | - | | | $ | (74,906 | ) | | $ | 381,270 | |
| Intra-segment sales | | | (8,559 | ) | | | (13,941 | ) | | | - | | | | 22,500 | | | | - | |
| Inter-segment sales | | | (47,736 | ) | | | (4,670 | ) | | | - | | | | 52,406 | | | | - | |
| Total consolidated net sales | | | 284,161 | | | | 97,109 | | | | - | | | | - | | | | 381,270 | |
| | | | | | | | | | | | | | | | | | | | | |
| Cost of goods sold: | | | | | | | | | | | | | | | | | | | | |
| Cost of goods sold | | | 262,298 | | | | 91,736 | | | | - | | | | (75,324 | ) | | | 278,710 | |
| Intra-segment cost of goods sold | | | (8,559 | ) | | | (13,941 | ) | | | - | | | | 22,500 | | | | - | |
| Inter-segment cost of goods sold | | | (47,736 | ) | | | (4,670 | ) | | | - | | | | 52,406 | | | | - | |
| Total consolidated cost of goods sold | | | 206,003 | | | | 73,125 | | | | - | | | | (418 | ) | | | 278,710 | |
| | | | | | | | | | | | | | | | | | | | | |
| Gross profit | | | 78,158 | | | | 23,984 | | | | - | | | | (418 | ) | | | 102,560 | |
| | | | | | | | | | | | | | | | | | | | | |
| Marketing, engineering and administrative expenses | | | 43,729 | | | | 15,373 | | | | 25,353 | | | | - | | | | 84,455 | |
| Restructuring expense | | | 366 | | | | - | | | | - | | | | - | | | | 366 | |
| Other operating income | | | 152 | | | | - | | | | (373 | ) | | | - | | | | (221 | ) |
| Operating income (loss) | | | 33,911 | | | | 8,611 | | | | (24,980 | ) | | | (418 | ) | | | 17,960 | |
| | | | | | | | | | | | | | | | | | | | | |
| Other income (expense): | | | | | | | | | | | | | | | | | | | | |
| Interest income | | | 1,567 | | | | 542 | | | | 1,880 | | | | (3,956 | ) | | | 33 | |
| Interest expense | | | (6,958 | ) | | | (9 | ) | | | (67 | ) | | | 3,956 | | | | (3,078 | ) |
| Other income (expense) | | | (13,214 | ) | | | (6,713 | ) | | | 18,711 | | | | (103 | ) | | | (1,319 | ) |
| Total consolidated other income (expense) | | | (18,605 | ) | | | (6,180 | ) | | | 20,524 | | | | (103 | ) | | | (4,364 | ) |
| | | | | | | | | | | | | | | | | | | | | |
| Pretax earnings (loss) | | | 15,306 | | | | 2,431 | | | | (4,456 | ) | | | (521 | ) | | | 13,596 | |
| | | | | | | | | | | | | | | | | | | | | |
| Income tax benefit (expense) | | | (14,085 | ) | | | (2,132 | ) | | | 30,229 | | | | (38 | ) | | | 13,974 | |
| Net income (loss) | | | 1,221 | | | | 299 | | | | 25,773 | | | | (559 | ) | | | 27,570 | |
| | | | | | | | | | | | | | | | | | | | | |
| Minority interest | | | - | | | | 493 | | | | - | | | | - | | | | 493 | |
| Net income (loss) attributable to Twin Disc, Incorporated | | $ | 1,221 | | | $ | (194 | ) | | $ | 25,773 | | | $ | (559 | ) | | $ | 27,077 | |
| | | | | | | | | | | | | | | | | | | | | |
| | | | | | | | | | | | | | | | | | | | | |
| Total consolidated assets | | $ | 521,842 | | | $ | 78,369 | | | $ | (142,599 | ) | | $ | (56,367 | ) | | $ | 401,245 | |
| | | | | | | | | | | | | | | | | | | | | |
| Depreciation and amortization | | $ | 11,925 | | | $ | 396 | | | $ | 1,425 | | | $ | - | | | $ | 13,746 | |
| Expenditures for segment assets | | | 10,452 | | | | 1,003 | | | | 2,258 | | | | - | | | | 13,713 | |
| | | Manufacturing | | | Distribution | | | Corporate | | | Elimination and adjustments | | | As Adjusted Consolidated | |
| Net sales: | | | | | | | | | | | | | | | | | | | | |
| Net sales | | $ | 295,550 | | | $ | 130,956 | | | $ | - | | | $ | (85,768 | ) | | $ | 340,738 | |
| Intra-segment sales | | | (7,213 | ) | | | (21,043 | ) | | | - | | | | 28,256 | | | | - | |
| Inter-segment sales | | | (52,691 | ) | | | (4,821 | ) | | | - | | | | 57,512 | | | | - | |
| Total consolidated net sales | | | 235,646 | | | | 105,092 | | | | - | | | | - | | | | 340,738 | |
| | | | | | | | | | | | | | | | | | | | | |
| Cost of goods sold: | | | | | | | | | | | | | | | | | | | | |
| Cost of goods sold | | | 228,610 | | | | 104,165 | | | | - | | | | (85,960 | ) | | | 246,815 | |
| Intra-segment cost of goods sold | | | (7,213 | ) | | | (21,043 | ) | | | - | | | | 28,256 | | | | - | |
| Inter-segment cost of goods sold | | | (52,691 | ) | | | (4,821 | ) | | | - | | | | 57,512 | | | | - | |
| Total consolidated cost of goods sold | | | 168,706 | | | | 78,301 | | | | - | | | | (192 | ) | | | 246,815 | |
| | | | | | | | | | | | | | | | | | | | | |
| Gross profit | | | 66,940 | | | | 26,791 | | | | - | | | | (192 | ) | | | 93,923 | |
| | | | | | | | | | | | | | | | | | | | | |
| Marketing, engineering and administrative expenses | | | 41,388 | | | | 14,796 | | | | 26,247 | | | | - | | | | 82,431 | |
| Restructuring expenses | | | 252 | | | | 93 | | | | 63 | | | | - | | | | 408 | |
| Operating income (loss) | | | 25,300 | | | | 11,902 | | | | (26,310 | ) | | | (192 | ) | | | 11,084 | |
| | | | | | | | | | | | | | | | | | | | | |
| Other income (expense): | | | | | | | | | | | | | | | | | | | | |
| Interest income | | | 1,045 | | | | 550 | | | | 1,801 | | | | (3,329 | ) | | | 67 | |
| Interest expense | | | (5,900 | ) | | | (7 | ) | | | (68 | ) | | | 3,329 | | | | (2,646 | ) |
| Other income (expense) | | | (14,725 | ) | | | (6,537 | ) | | | 15,818 | | | | (95 | ) | | | (5,539 | ) |
| Total consolidated other income (expense) | | | (19,580 | ) | | | (5,994 | ) | | | 17,551 | | | | (95 | ) | | | (8,118 | ) |
| | | | | | | | | | | | | | | | | | | | | |
| Pretax earnings (loss) | | | 5,720 | | | | 5,908 | | | | (8,759 | ) | | | (287 | ) | | | 2,966 | |
| | | | | | | | | | | | | | | | | | | | | |
| Income tax benefit (expense) | | | (1,476 | ) | | | (2,151 | ) | | | 228 | | | | 31 | | | | (3,368 | ) |
| Net income (loss) | | | 4,244 | | | | 3,757 | | | | (8,531 | ) | | | (256 | ) | | | (402 | ) |
| | | | | | | | | | | | | | | | | | | | | |
| Minority interest | | | - | | | | (295 | ) | | | - | | | | - | | | | (295 | ) |
| Net income (loss) attributable to Twin Disc, Incorporated | | $ | 4,244 | | | $ | 3,462 | | | $ | (8,531 | ) | | $ | (256 | ) | | $ | (697 | ) |
| | | | | | | | | | | | | | | | | | | | | |
| | | | | | | | | | | | | | | | | | | | | |
| Total consolidated assets | | $ | 519,247 | | | $ | 66,087 | | | $ | (186,291 | ) | | $ | (11,347 | ) | | $ | 387,696 | |
| | | | | | | | | | | | | | | | | | | | | |
| Depreciation and amortization | | $ | 13,281 | | | $ | 353 | | | $ | 1,265 | | | $ | - | | | $ | 14,899 | |
| Expenditures for segment assets | | | 11,590 | | | | 1,902 | | | | 1,665 | | | | - | | | | 15,157 | |
|