SIGNIFICANT ACCOUNTING POLICIES (Details) (USD $)	12 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2010	Dec. 31, 2010
Translation of Foreign Currencies [Abstract]
Foreign currency transaction (gains) losses	$ 642,000	$ 1,103,000	$ (1,141,000)
Receivables [Abstract]
Allowance for doubtful accounts	2,884,000	2,194,000
Reclassification [Abstract]
Amount reclassified from buildings to land	478,000
Revision of Prior Period Financial Statements [Abstract]
Change in earnings attributable to change in uncertain tax positions		69,000	50,000
Cumulative effect of adjustments					658,000
Change in shareholders equity attributable to adjustment		700,000	783,000	83,000
Revised consolidated balance sheet amounts [Abstract]
Accrued liabilities	39,171,000	39,331,000
Total current liabilities	63,503,000	66,625,000
Other long term liabilities	3,706,000	4,948,000
Total liabilities	141,896,000	167,323,000
Retained earnings	184,110,000	184,306,000
Total equity	143,562,000	136,509,000	136,646,000	88,744,000
Revised consolidated statement of operations and comprehensive income (loss) amounts [Abstract]
Income taxes	4,986,000	17,815,000	13,897,000
Net earnings	4,251,000	26,941,000	18,132,000
Near earnings attributable to Twin Disc	3,882,000	26,743,000	17,997,000
Basic earnings per share (in dollars per share)	$ 0.34	$ 2.34	$ 1.59
Diluted earnings per share (in dollars per share)	$ 0.34	$ 2.31	$ 1.57
Comprehensive income (loss)	13,020,000	3,513,000	48,910,000
Comprehensive income (loss) attributable to Twin Disc	12,651,000	3,315,000	48,775,000
Revised consolidated statement of cash flows amounts [Abstract]
Net earnings	4,251,000	26,941,000	18,132,000
Reported [Member]
Revised consolidated balance sheet amounts [Abstract]
Accrued liabilities		0	41,673,000
Total current liabilities		0	83,960,000
Other long term liabilities		4,171,000	7,089,000
Total liabilities		166,546,000	171,066,000
Retained earnings		185,083,000	162,857,000
Total equity		137,286,000	138,054,000
Revised consolidated statement of operations and comprehensive income (loss) amounts [Abstract]
Income taxes		18,446,000	13,064,000
Net earnings		26,310,000	18,965,000
Near earnings attributable to Twin Disc		26,112,000	18,830,000
Basic earnings per share (in dollars per share)		$ 2.29	$ 1.66
Diluted earnings per share (in dollars per share)		$ 2.26	$ 1.64
Comprehensive income (loss)		2,882,000	49,743,000
Comprehensive income (loss) attributable to Twin Disc		2,684,000	49,608,000
Revised consolidated statement of cash flows amounts [Abstract]
Net earnings		26,310,000	18,965,000
Accrued liabilities		(2,273,000)	6,713,000
Adjustment [Member]
Revised consolidated balance sheet amounts [Abstract]
Accrued liabilities		0	700,000
Total current liabilities		0	700,000
Other long term liabilities		777,000	708,000
Total liabilities		777,000	1,408,000
Retained earnings		(777,000)	(1,408,000)
Total equity		(777,000)	(1,408,000)
Revised consolidated statement of operations and comprehensive income (loss) amounts [Abstract]
Income taxes		(631,000)	833,000
Net earnings		631,000	(833,000)
Near earnings attributable to Twin Disc		631,000	(833,000)
Basic earnings per share (in dollars per share)		$ 0.05	$ (0.07)
Diluted earnings per share (in dollars per share)		$ 0.05	$ (0.07)
Comprehensive income (loss)		631,000	(833,000)
Comprehensive income (loss) attributable to Twin Disc		631,000	(833,000)
Revised consolidated statement of cash flows amounts [Abstract]
Net earnings		631,000	(833,000)
Accrued liabilities		(631,000)	833,000
Revised [Member]
Revised consolidated balance sheet amounts [Abstract]
Accrued liabilities		0	42,373,000
Total current liabilities		0	84,660,000
Other long term liabilities		4,948,000	7,797,000
Total liabilities		167,323,000	172,474,000
Retained earnings		184,306,000	161,449,000
Total equity		136,509,000	136,646,000
Revised consolidated statement of operations and comprehensive income (loss) amounts [Abstract]
Income taxes		17,815,000	13,897,000
Net earnings		26,941,000	18,132,000
Near earnings attributable to Twin Disc		26,743,000	17,997,000
Basic earnings per share (in dollars per share)		$ 2.34	$ 1.59
Diluted earnings per share (in dollars per share)		$ 2.31	$ 1.57
Comprehensive income (loss)		3,513,000	48,910,000
Comprehensive income (loss) attributable to Twin Disc		3,315,000	48,775,000
Revised consolidated statement of cash flows amounts [Abstract]
Net earnings		26,941,000	18,132,000
Accrued liabilities		(2,904,000)	7,546,000
Building and Building Improvements [Member] | Minimum [Member]
Property, Plant and Equipment and Depreciation [Abstract]
Life assigned to building, improvements, machinery and equipment (in years)	10 years
Building and Building Improvements [Member] | Maximum [Member]
Property, Plant and Equipment and Depreciation [Abstract]
Life assigned to building, improvements, machinery and equipment (in years)	40 years
Machinery and Equipment [Member] | Minimum [Member]
Property, Plant and Equipment and Depreciation [Abstract]
Life assigned to building, improvements, machinery and equipment (in years)	5 years
Machinery and Equipment [Member] | Maximum [Member]
Property, Plant and Equipment and Depreciation [Abstract]
Life assigned to building, improvements, machinery and equipment (in years)	15 years
Senior Notes [Member]
Debt Instrument [Line Items]
Interest rate on senior notes (in hundredths)	6.05%	6.05%
Fair value of senior notes	$ 11,536,000	$ 15,768,000
Maturity date of senior notes	Apr. 10, 2016
Period of yield curve rate	3 years
Reference rate used to estimate fair value of financial instruments (in hundredths)	0.66%	0.41%
Basis spread on variable rate (in hundredths)	1.65%	1.50%
Calculated rate used to estimate fair value of financial instruments (in hundredths)	2.31%	1.91%