| Accounting Standards Update and Change in Accounting Principle [Table Text Block] |
| Consolidated Statements of Operations and Comprehensive Income (Loss) | | As Computed Under Previous Method | | | Effect of Accounting Change | | | As Reported Under New Method | |
| Cost of goods sold | | $ | 279,197 | | | $ | (487 | ) | | $ | 278,710 | |
| Gross profit | | | 102,073 | | | | 487 | | | | 102,560 | |
| Income (loss) from operations | | | 17,473 | | | | 487 | | | | 17,960 | |
| Income (loss) before income taxes and noncontrolling interest | | | 13,109 | | | | 487 | | | | 13,596 | |
| Income tax benefit (expense) | | | 21,322 | | | | (7,348 | ) | | | 13,974 | |
| Net income (loss) | | | 34,659 | | | | (7,089 | ) | | | 27,570 | |
| Net income (loss) attributable to Twin Disc, Incorporated | | | 34,166 | | | | (7,089 | ) | | | 27,077 | |
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| Comprehensive income (loss) | | | | | | | | | | | | |
| Net income (loss) | | $ | 34,659 | | | $ | (7,089 | ) | | $ | 27,570 | |
| Comprehensive income (loss) | | | 31,083 | | | | (7,089 | ) | | | 23,994 | |
| Comprehensive income (loss) attributable to Twin Disc, Incorporated | | | 30,724 | | | | (7,089 | ) | | | 23,635 | |
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| Earnings (loss) per share data: | | | | | | | | | | | | |
| Basic earnings (loss) per share attributable to Twin Disc, Incorporated common shareholders | | $ | 2.42 | | | $ | (0.50 | ) | | $ | 1.92 | |
| Diluted earnings (loss) per share attributable to Twin Disc, Incorporated common shareholders | | $ | 2.34 | | | $ | (0.49 | ) | | $ | 1.86 | |
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| Weighted average shares outstanding data: | | | | | | | | | | | | |
| Basic shares outstanding | | | 14,119 | | | | - | | | | 14,119 | |
| Diluted shares outstanding | | | 14,586 | | | | - | | | | 14,586 | |
| Consolidated Balance Sheets | | As Computed Under Previous Method | | | Effect of Accounting Change | | | As Reported Under New Method | |
| Inventories, net | | $ | 145,407 | | | $ | 32,621 | | | $ | 178,028 | |
| Deferred income tax assets | | | 28,669 | | | | (7,576 | ) | | | 21,093 | |
| Retained earnings | | | 157,295 | | | | 25,045 | | | | 182,340 | |
| Consolidated Statements of Cash Flows | | As Computed Under Previous Method | | | Effect of Accounting Change | | | As Reported Under New Method | |
| Cash flows from operating activities: | | | | | | | | | | | | |
| Net income (loss) | | $ | 34,659 | | | $ | (7,089 | ) | | $ | 27,570 | |
| Adjustments to reconcile net income (loss) to net cash provided (used) by operating activities: | | | | | | | | | | | | |
| Changes in operating assets and liabilities, net of acquired business | | | | | | | | | | | | |
| Inventories, net | | | 3,778 | | | | (487 | ) | | | 3,291 | |
| Provision for deferred income taxes | | | (25,622 | ) | | | 7,576 | | | | (18,046 | ) |
| Net cash provided (used) by operating activities | | | 22,899 | | | | - | | | | 22,899 | |
| Consolidated Statements of Changes in Equity | | As Computed Under Previous Method | | | Effect of Accounting Change | | | As Reported Under New Method | |
| Retained earnings | | | | | | | | | | | | |
| Balance at June 30, 2025 | | $ | 125,414 | | | $ | 32,134 | | | $ | 157,548 | |
| Net income (loss) attributable to Twin Disc, Incorporated | | | 34,166 | | | | (7,089 | ) | | | 27,077 | |
| Dividends paid to shareholders and non-controlling interest | | | (2,285 | ) | | | | | | | (2,285 | ) |
| Balance at June 30, 2026 | | $ | 157,295 | | | $ | 25,045 | | | $ | 182,340 | |
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