CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) (Parenthetical) (USD $)	Sep. 30, 2011	Jun. 30, 2011
Twin Disc shareholders' equity:
Common shares, authorized (in shares)	30,000,000	30,000,000
Common shares, issued (in shares)	13,099,468	13,099,468
Common shares, no par value (in dollars per share)	$ 0.00	$ 0.00
Treasury stock, shares (in shares)	1,679,767	1,739,574