Consolidated Balance Sheets (Parenthetical) (USD $)	Jun. 30, 2012	Jun. 30, 2011
Consolidated Balance Sheets [Abstract]
Common stock, shares authorized	200,000,000	200,000,000
Common stock, par value	$ 0.001	$ 0.001
Common stock, shares issued	45,548,902	45,152,805
Common stock, shares outstanding	45,548,902	45,152,805
Preferred stock, shares authorized	50,000,000	50,000,000
Preferred stock, par value	$ 0.001	$ 0.001
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
Treasury shares, shares outstanding	13,455,090	13,274,434