Basis of Presentation (Details) (USD $)	3 Months Ended		6 Months Ended		12 Months Ended			3 Months Ended					6 Months Ended	9 Months Ended	12 Months Ended		3 Months Ended					6 Months Ended	9 Months Ended	12 Months Ended		3 Months Ended					6 Months Ended	9 Months Ended	12 Months Ended
	Dec. 28, 2012	Dec. 30, 2011	Dec. 28, 2012	Dec. 30, 2011	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2010	Sep. 28, 2012 As Reported [Member]	Jun. 30, 2012 As Reported [Member]	Mar. 30, 2012 As Reported [Member]	Dec. 30, 2011 As Reported [Member]	Sep. 30, 2011 As Reported [Member]	Dec. 30, 2011 As Reported [Member]	Mar. 30, 2012 As Reported [Member]	Jun. 30, 2012 As Reported [Member]	Jun. 30, 2011 As Reported [Member]	Sep. 28, 2012 Adjustment [Member]	Jun. 30, 2012 Adjustment [Member]	Mar. 30, 2012 Adjustment [Member]	Dec. 30, 2011 Adjustment [Member]	Sep. 30, 2011 Adjustment [Member]	Dec. 30, 2011 Adjustment [Member]	Mar. 30, 2012 Adjustment [Member]	Jun. 30, 2012 Adjustment [Member]	Jun. 30, 2011 Adjustment [Member]	Sep. 28, 2012 As Revised [Member]	Jun. 30, 2012 As Revised [Member]	Mar. 30, 2012 As Revised [Member]	Dec. 30, 2011 As Revised [Member]	Sep. 30, 2011 As Revised [Member]	Dec. 30, 2011 As Revised [Member]	Mar. 30, 2012 As Revised [Member]	Jun. 30, 2012 As Revised [Member]	Jun. 30, 2011 As Revised [Member]
Revision of Prior Period Financial Statements [Abstract]
change in earnings attributable to change in uncertain tax positions					$ 69,000	$ 50,000	$ 104,000
Change in shareholders equity attributable to adjustment					700,000	(783,000)	83,000
Cumulative effect of adjustments						658,000	83,000
Excess tax benefit recorded in operating activities		90,000
Revised consolidated balance sheet amounts [Abstract]
Accrued liabilities	32,736,000		32,736,000		39,331,000						38,056,000	38,301,000	38,056,000			41,673,000				608,000	608,000	608,000			700,000				38,664,000	38,909,000	38,664,000			42,373,000
Total current liabilities	60,800,000		60,800,000		66,625,000						77,872,000	77,165,000	77,872,000			83,960,000				608,000	608,000	608,000			700,000				78,480,000	77,773,000	78,480,000			84,660,000
Other long term liabilities	3,291,000		3,291,000		4,948,000			2,200,000	4,171,000	4,478,000	4,845,000	4,363,000	4,845,000	4,478,000	4,171,000	7,089,000	797,000	777,000	759,000	742,000	725,000	742,000	759,000	777,000	708,000	2,997,000	4,948,000	5,237,000	5,587,000	5,088,000	5,587,000	5,237,000	4,948,000	7,797,000
Total liabilities	158,427,000		158,427,000		167,323,000			160,512,000	166,546,000	168,130,000	170,822,000	170,619,000	170,822,000	168,130,000	166,546,000	171,066,000	797,000	777,000	759,000	1,350,000	1,333,000	1,350,000	759,000	777,000	1,408,000	161,309,000	167,323,000	168,889,000	172,172,000	171,952,000	172,172,000	168,889,000	167,323,000	172,474,000
Retained earnings	186,842,000		186,842,000		184,306,000			185,308,000	185,083,000	184,831,000	176,467,000	171,524,000	176,467,000	184,831,000	185,083,000	162,857,000	(797,000)	(777,000)	(759,000)	(1,350,000)	(1,333,000)	(1,350,000)	(759,000)	(777,000)	(1,408,000)	184,511,000	184,306,000	184,072,000	175,117,000	170,191,000	175,117,000	184,072,000	184,306,000	161,449,000
Total equity	141,149,000	144,236,000	141,149,000	144,236,000	136,509,000	136,646,000		139,587,000	137,286,000	157,231,000	145,586,000	145,811,000	145,586,000	157,231,000	137,286,000	138,054,000	(797,000)	(777,000)	(759,000)	(1,350,000)	(1,333,000)	(1,350,000)	(759,000)	(777,000)	(1,408,000)	138,790,000	136,509,000	156,472,000	144,236,000	144,478,000	144,236,000	156,472,000	136,509,000	136,646,000
Revised consolidated statement of operations and comprehensive income (loss) amounts [Abstract]
Income taxes	1,815,000	3,385,000	2,912,000	8,569,000				1,077,000	4,407,000	5,412,000	3,368,000	5,259,000	8,627,000	14,039,000	18,446,000	13,064,000	20,000	18,000	(591,000)	17,000	(75,000)	(58,000)	(649,000)	(631,000)	833,000	1,097,000	4,425,000	4,821,000	3,385,000	5,184,000	8,569,000	13,390,000	17,815,000	13,897,000
Net earnings	3,419,000	5,849,000	4,685,000	15,559,000				1,286,000	1,371,000	9,438,000	5,866,000	9,635,000	15,501,000	24,939,000	26,310,000	18,965,000	(20,000)	(18,000)	591,000	(17,000)	75,000	58,000	649,000	631,000	(833,000)	1,266,000	1,353,000	10,029,000	5,849,000	9,710,000	15,559,000	25,588,000	26,941,000	18,132,000
Near earnings attributable to Twin Disc	3,360,000	5,840,000	4,591,000	15,496,000				1,251,000	1,281,000	9,393,000	5,857,000	9,581,000	15,438,000	24,831,000	26,112,000	18,830,000	(20,000)	(18,000)	591,000	(17,000)	75,000	58,000	649,000	631,000	(833,000)	1,231,000	1,263,000	9,984,000	5,840,000	9,656,000	15,496,000	25,480,000	26,743,000	17,997,000
Basic earnings per share (in dollars per share)	$ 0.30	$ 0.51	$ 0.41	$ 1.36				$ 0.11	$ 0.11	$ 0.82	$ 0.51	$ 0.84	$ 1.35	$ 2.18	$ 2.29	$ 1.66	$ 0	$ 0	$ 0.05	$ 0	$ 0.01	$ 0.01	$ 0.05	$ 0.05	$ (0.07)	$ 0.11	$ 0.11	$ 0.87	$ 0.51	$ 0.85	$ 1.36	$ 2.23	$ 2.34	$ 1.59
Diluted earnings per share (in dollars per share)	$ 0.29	$ 0.50	$ 0.40	$ 1.34				$ 0.11	$ 0.11	$ 0.81	$ 0.51	$ 0.83	$ 1.34	$ 2.15	$ 2.26	$ 1.64	$ 0	$ 0	$ 0.05	$ (0.01)	$ 0.01	$ 0	$ 0.05	$ 0.05	$ (0.07)	$ 0.11	$ 0.11	$ 0.86	$ 0.50	$ 0.84	$ 1.34	$ 2.20	$ 2.31	$ 1.57
Comprehensive income (loss)	6,201,000	2,000	9,399,000	7,911,000				3,218,000	(17,068,000)	12,097,000	19,000	7,834,000	7,853,000	19,950,000	2,882,000	49,743,000	20,000	(18,000)	591,000	(17,000)	75,000	58,000	649,000	631,000	(833,000)	3,238,000	(17,086,000)	12,688,000	2,000	7,909,000	7,911,000	20,599,000	3,513,000	48,910,000
Comprehensive income (loss) attributable to Twin Disc	6,142,000	(7,000)	9,305,000	7,848,000				3,183,000	(17,158,000)	12,052,000	10,000	7,780,000	7,790,000	19,842,000	2,684,000	49,608,000	20,000	(18,000)	591,000	(17,000)	75,000	58,000	649,000	631,000	(833,000)	3,203,000	(17,176,000)	12,643,000	(7,000)	7,855,000	7,848,000	20,491,000	3,315,000	48,775,000
Revised consolidated statement of cash flows amounts [Abstract]
Net earnings	3,419,000	5,849,000	4,685,000	15,559,000				1,286,000	1,371,000	9,438,000	5,866,000	9,635,000	15,501,000	24,939,000	26,310,000	18,965,000	(20,000)	(18,000)	591,000	(17,000)	75,000	58,000	649,000	631,000	(833,000)	1,266,000	1,353,000	10,029,000	5,849,000	9,710,000	15,559,000	25,588,000	26,941,000	18,132,000
Net change in working capital, excluding cash and debt, and other			(463,000)	28,215,000				(4,059,000)				(16,354,000)	(28,157,000)	(41,315,000)			20,000				(75,000)	(58,000)	(649,000)			(4,039,000)				(16,429,000)	(28,215,000)	(41,964,000)
Accrued liabilities															(2,273,000)	6,713,000								(631,000)	833,000								(2,904,000)	7,546,000
Cash flows from operating activities: [Abstract]
Other non-cash changes, net			(1,599,000)	(3,756,000)								2,950,000	4,291,000								(445,000)	(535,000)								2,505,000	3,756,000
Net cash used by operating activities			12,092,000	(3,589,000)								(1,196,000)	(3,054,000)								(445,000)	(535,000)								(1,641,000)	(3,589,000)
Cash flows from financing activities: [Abstract]
Excess tax benefits from stock compensation			1,276,000	535,000								0	0								445,000	535,000								445,000	535,000
Net cash provided by financing activities			$ (3,722,000)	$ 10,631,000								$ 10,051,000	$ 10,096,000								$ 445,000	$ 535,000								$ 10,496,000	$ 10,631,000