BUSINESS SEGMENTS AND FOREIGN OPERATIONS, RECONCILIATION OF REPORTABLE SEGMENT NET SALES, NET EARNINGS AND ASSETS TO CONSOLIDATED TOTALS (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2011
Net sales [Abstract]
Total consolidated net sales	$ 285,282	$ 355,870	$ 310,393
Net earnings attributable to Twin Disc [Abstract]
Other corporate expenses	(12,099)	(10,025)	(13,912)
Total consolidated net earnings attributable to Twin Disc	3,882	26,743	17,997
Assets [Abstract]
Total consolidated assets	285,458	303,832
Elimination of inter-company sales [Member]
Net sales [Abstract]
Total consolidated net sales	(90,670)	(98,715)	(85,796)
Reportable Segment [Member]
Net sales [Abstract]
Total consolidated net sales	375,952	454,585	396,189
Net earnings attributable to Twin Disc [Abstract]
Total consolidated net earnings attributable to Twin Disc	15,981	36,768	31,909
Assets [Abstract]
Total consolidated assets	315,582	330,373	325,482
Corporate Assets [Member]
Assets [Abstract]
Total consolidated assets	$ (30,124)	$ (26,541)