BUSINESS SEGMENTS AND FOREIGN OPERATIONS, Reconciliation of Reportable Segment Net Earnings Attributable to Twin Disc to Consolidated Totals (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2012
Segment Reconciliation [Abstract]
Net earnings attributable to Twin Disc	$ 3,644	$ 3,882	$ 26,743
Reportable Segments [Member]
Segment Reconciliation [Abstract]
Net earnings attributable to Twin Disc	13,314	15,981	36,768
Corporate [Member]
Segment Reconciliation [Abstract]
Net earnings attributable to Twin Disc	$ (9,670)	$ (12,099)	$ (10,025)